Archie  Clayton

Archie Clayton

1564817097

Using Slots In Vue.js

What Are Slots?

Slots are a mechanism for Vue components that allows you to compose your components in a way other than the strict parent-child relationship. Slots give you an outlet to place content in new places or make components more generic. The best way to understand them is to see them in action. Let’s start with a simple example:

// frame.vue
<template>
 <div class="frame">
   <slot></slot>
 </div>
</template>

This component has a wrapper div. Let’s pretend that div is there to create a stylistic frame around its content. This component is able to be used generically to wrap a frame around any content you want. Let’s see what it looks like to use it. The frame component here refers to the component we just made above.

// app.vue
<template>
 <frame><img src="an-image.jpg"></frame>
</template>

The content that is between the opening and closing frame tags will get inserted into the frame component where the slot is, replacing the slot tags. This is the most basic way of doing it. You can also specify default content to go into a slot simply by filling it in:

// frame.vue
<template>
 <div class="frame">
   <slot>This is the default content if nothing gets specified to go here</slot>
 </div>
</template>

So now if we use it like this instead:

// app.vue
<template>
 <frame />
</template>

The default text of “This is the default content if nothing gets specified to go here” will show up, but if we use it as we did before, the default text will be overridden by the img tag.

Multiple/Named Slots

You can add multiple slots to a component, but if you do, all but one of them is required to have a name. If there is one without a name, it is the default slot. Here’s how you create multiple slots:

// titled-frame.vue
<template>
 <div class="frame">
   <header><h2><slot name="header">Title</slot></h2></header>
   <slot>This is the default content if nothing gets specified to go here</slot>
 </div>
</template>

We kept the same default slot, but this time we added a slot named header where you can enter a title. You use it like this:

// app.vue
<template>
 <titled-frame>
   <template v-slot:header>
     <!-- The code below goes into the header slot -->
     My Image’s Title
   </template>
   <!-- The code below goes into the default slot -->
   <img src="an-image.jpg">
 </titled-frame>
</template>

Just like before, if we want to add content to the default slot, just put it directly inside the titled-frame component. To add content to a named slot, though, we needed to wrap the code in a template tag with a v-slot directive. You add a colon (:) after v-slot and then write the name of the slot you want the content to be passed to. Note that v-slot is new to Vue 2.6, so if you’re using an older version, you’ll need to read the docs about the deprecated slot syntax.

Scoped Slots

One more thing you’ll need to know is that slots can pass data/functions down to their children. To demonstrate this, we’ll need a completely different example component with slots, one that’s even more contrived than the previous one: let’s sorta copy the example from the docs by creating a component that supplies the data about the current user to its slots:

// current-user.vue
<template>
 <span>
   <slot v-bind:user="user">
     {{ user.lastName }}
   </slot>
 </span>
</template>

<script>
export default {
 data () {
   return {
     user: …
   }
 }
}
</script>

This component has a property called user with details about the user. By default, the component shows the user’s last name, but note that it is using v-bind to bind the user data to the slot. With that, we can use this component to provide the user data to its descendant:

// app.vue
<template>
 <current-user>
   <template v-slot:default=“slotProps”>{{ slotProps.user.firstName }}</template>   
  </current-user>
</template>

To get access to the data passed to the slot, we specify the name of the scope variable with the value of the v-slot directive.

There are a few notes to take here:

  • We specified the name of default, though we don’t need to for the default slot. Instead we could just use v-slot=“slotProps”.
  • You don’t need to use slotProps as the name. You can call it whatever you want.
  • If you’re only using a default slot, you can skip that inner template tag and put the v-slot directive directly onto the current-user tag.
  • You can use object destructuring to create direct references to the scoped slot data rather than using a single variable name. In other words, you can use v-slot=“{user}” instead of v-slot=“slotProps” and then you can use user directly instead of slotProps.user.

Taking those notes into account, the above example can be rewritten like this:

// app.vue
<template>
 <current-user v-slot=“{user}”>
   {{ user.firstName }}
 </current-user>
</template>

A couple more things to keep in mind:

  • You can bind more than one value with v-bind directives. So in the example, I could have done more than just user.
  • You can pass functions to scoped slots too. Many libraries use this to provide reusable functional components as you’ll see later.
  • v-slot has an alias of #. So instead of writing v-slot:header=“data”, you can write #header=“data”. You can also just specify #header instead of v-slot:header when you’re not using scoped slots. As for default slots, you’ll need to specify the name of default when you use the alias. In other words, you’ll need to write #default=“data” instead of #=“data”.

There are a few more minor points you can learn about from the docs, but that should be enough to help you understand what we’re talking about in the rest of this article.

What Can You Do With Slots?

Slots weren’t built for a single purpose, or at least if they were, they’ve evolved way beyond that original intention to be a powerhouse tool for doing many different things.

Reusable Patterns

Components were always designed to be able to be reused, but some patterns aren’t practical to enforce with a single “normal” component because the number of props you’ll need in order to customize it can be excessive or you’d need to pass large sections of content and potentially other components through the props. Slots can be used to encompass the “outside” part of the pattern and allow other HTML and/or components to placed inside of them to customize the “inside” part, allowing the component with slots to define the pattern and the components injected into the slots to be unique.

For our first example, let’s start with something simple: a button. Imagine you and your team are using Bootstrap*. With Bootstrap, your buttons are often strapped with the base btn class and a class specifying the color, such as btn-primary. You can also add a size class, such as btn-lg.

Let’s now assume, for simplicity’s sake that your app/site always uses btn-primary and btn-lg. You don’t want to always have to write all three classes on your buttons, or maybe you don’t trust a rookie to remember to do all three. In that case, you can create a component that automatically has all three of those classes, but how do you allow customization of the content? A prop isn’t practical because a button tag is allowed to have all kinds of HTML in it, so we should use a slot.

<!-- my-button.vue -->
<template>
 <button class=“btn btn-primary btn-lg”>
   <slot>Click Me!</slot>
 </button>
</template>

Now we can use it everywhere with whatever content you want:

<!-- somewhere else, using my-button.vue -->
<template>
 <my-button>
   <img src=“/img/awesome-icon.jpg”> SMASH THIS BUTTON TO BECOME AWESOME FOR ONLY $500!!!
 </my-button>
</template>

Of course, you can go with something much bigger than a button. Sticking with Bootstrap, let’s look at a modal, or least the HTML part; I won’t be going into functionality… yet.

<!-- my-modal.vue -->
<template>
<div class=“modal” tabindex=“-1” role=“dialog”>
 <div class=“modal-dialog” role=“document”>
   <div class=“modal-content”>
     <div class=“modal-header”>
       <slot name=“header”></slot>
       <button type=“button” class=“close” data-dismiss=“modal” aria-label=“Close”>
         <span aria-hidden=“true”>×</span>
       </button>
     </div>
     <div class=“modal-body”>
       <slot name=“body”></slot>
     </div>
     <div class=“modal-footer”>
       <slot name=“footer”></slot>
     </div>
   </div>
 </div>
</div>
</template>

Now, let’s use this:

<!-- somewhere else, using my-modal.vue -->
<template>
 <my-modal>
   <template #header><!-- using the shorthand for v-slot -->
     <h5>Awesome Interruption!</h5>
   </template>
   <template #body>
     <p>We interrupt your use of our application to
     let you know that this application is awesome
      and you should continue using it every day for
      the rest of your life!</p>
   </template>
   <template #footer>
     <em>Now back to your regularly scheduled app usage</em>
   </template>
 </my-modal>
</template>

The above type of use case for slots is obviously very useful, but it can do even more.

Reusing Functionality

Vue components aren’t all about the HTML and CSS. They’re built with JavaScript, so they’re also about functionality. Slots can be useful for creating functionality once and using it in multiple places. Let’s go back to our modal example and add a function that closes the modal:

<!-- my-modal.vue -->
<template>
<div class=“modal” tabindex=“-1” role=“dialog”>
 <div class=“modal-dialog” role=“document”>
   <div class=“modal-content”>
     <div class=“modal-header”>
       <slot name=“header”></slot>
       <button type=“button” class=“close” data-dismiss=“modal” aria-label=“Close”>
         <span aria-hidden=“true”>×</span>
       </button>
     </div>
     <div class=“modal-body”>
       <slot name=“body”></slot>
     </div>
     <div class=“modal-footer”>
       <!–
          using v-bind shorthand to pass the closeModal method
          to the component that will be in this slot
        -->
       <slot name=“footer” :closeModal=“closeModal”></slot>
     </div>
   </div>
 </div>
</div>
</template>

<script>
export default {
 //…
 methods: {
   closeModal () {
     // Do what needs to be done to close the modal… and maybe remove it from the DOM
   }
 }
}
</script>

Now when you use this component, you can add a button to the footer that can close the modal. Normally, in the case of a Bootstrap modal, you could just add data-dismiss=“modal” to a button, but we want to hide Bootstrap specific things away from the components that will be slotting into this modal component. So we pass them a function they can call and they are none the wiser about Bootstrap’s involvement:

<!-- somewhere else, using my-modal.vue -->
<template>
 <my-modal>
   <template #header><!-- using the shorthand for v-slot -->
     <h5>Awesome Interruption!</h5>
   </template>
   <template #body>
     <p>We interrupt your use of our application to
     let you know that this application is awesome
      and you should continue using it every day for
      the rest of your life!</p>
   </template>
   <!-- pull in closeModal and use it in a button’s click handler -->
   <template #footer=“{closeModal}”>
     <button @click=“closeModal”>
       Take me back to the app so I can be awesome
     </button>
   </template>
 </my-modal>
</template>

Renderless Components

And finally, you can take what you know about using slots to pass around reusable functionality and strip practically all of the HTML and just use the slots. That’s essentially what a renderless component is: a component that provides only functionality without any HTML.

Making components truly renderless can be a little tricky because you’ll need to write render functions rather than using a template in order to remove the need for a root element, but it may not always be necessary. Let’s take a look at a simple example that does let us use a template first, though:

<template>
 <transition name=“fade” v-bind=“$attrs” v-on=“$listeners”>
   <slot></slot>
 </transition>
</template>
<style>
.fade-enter-active,
.fade-leave-active {
 transition: opacity 0.3s;
}
.fade-enter, .fade-leave-to {
 opacity: 0;
}
</style>

This is an odd example of a renderless component because it doesn’t even have any JavaScript in it. That’s mostly because we’re just creating a pre-configured reusable version of a built-in renderless function: transition.

Yup, Vue has built-in renderless components. This particular example is taken from an article on reusable transitions by Cristi Jora and shows a simple way to create a renderless component that can standardize the transitions used throughout your application. Cristi’s article goes into a lot more depth and shows some more advanced variations of reusable transitions, so I recommend checking it out.

For our other example, we’ll create a component that handles switching what is shown during the different states of a Promise: pending, successfully resolved, and failed. It’s a common pattern and while it doesn’t require a lot of code, it can muddy up a lot of your components if the logic isn’t pulled out for reusability.

<!-- promised.vue -->
<template>
 <span>
   <slot  name=“rejected”  v-if=“error” :error=“error”></slot>
   <slot  name=“resolved”  v-else-if=“resolved” :data=“data”></slot>
   <slot  name=“pending”  v-else></slot>
 </span>
</template>

<script>
export default {
 props: {
   promise: Promise
 },

 data: () => ({
   resolved: false,
   data: null,
   error: null
 }), 

 watch: {
   promise: {
     handler (promise) {
       this.resolved = false
       this.error = null

       if (!promise) {
         this.data = null
         return
       }

       promise.then(data => {
         this.data = data
         this.resolved = true
       })
       .catch(err => {
         this.error = err
         this.resolved = true
       })
     },
     immediate: true
   }
 }
}
</script>

So what is going on here? First, note that we are receiving a prop called promise that is a Promise. In the watch section we watch for changes to the promise and when it changes (or immediately on component creation thanks to the immediate property) we clear the state, and call then and catch on the promise, updating the state when it either finishes successfully or fails.

Then, in the template, we show a different slot based on the state. Note that we failed to keep it truly renderless because we needed a root element in order to use a template. We’re passing data and error to the relevant slot scopes as well.

And here’s an example of it being used:

<template>
 <div>
   <promised :promise=“somePromise”>
     <template #resolved=“{ data }”>
       Resolved: {{ data }}
     </template>
     <template #rejected=“{ error }”>
       Rejected: {{ error }}
     </template>
     <template #pending>
       Working on it…
     </template>
   </promised>
 </div>
</template>

We pass in somePromise to the renderless component. While we’re waiting for it to finish, we’re displaying “Working on it…” thanks to the pending slot. If it succeeds we display “Resolved:” and the resolution value. If it fails we display “Rejected:” and the error that caused the rejection. Now we no longer need to track the state of the promise within this component because that part is pulled out into its own reusable component.

So, what can we do about that span wrapping around the slots in promised.vue? To remove it, we’ll need to remove the template portion and add a render function to our component:

render () {
 if (this.error) {
   return this.$scopedSlots[‘rejected’]({error: this.error})
 }

 if (this.resolved) {
   return this.$scopedSlots[‘resolved’]({data: this.data})
 }

 return this.$scopedSlots’pending’
}

There isn’t anything too tricky going on here. We’re just using some if blocks to find the state and then returning the correct scoped slot (via this.$scopedSlots’SLOTNAME’) and passing the relevant data to the slot scope. When you’re not using a template, you can skip using the .vue file extension by pulling the JavaScript out of the script tag and just plunking it into a .js file. This should give you a very slight performance bump when compiling those Vue files.

This example is a stripped-down and slightly tweaked version of vue-promised, which I would recommend over using the above example because they cover over some potential pitfalls. There are plenty of other great examples of renderless components out there too. Baleada is an entire library full of renderless components that provide useful functionality like this. There’s also vue-virtual-scroller for controlling the rendering of list item based on what is visible on the screen or PortalVue for “teleporting” content to completely different parts of the DOM.

Thanks for reading

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Further reading

The Complete JavaScript Course 2019: Build Real Projects!

Vue JS 2 - The Complete Guide (incl. Vue Router & Vuex)

Nuxt.js - Vue.js on Steroids

Best JavaScript Frameworks, Libraries and Tools to Use in 2019

Build a Progressive Web App In VueJs

Build a CMS with Laravel and Vue

Beginner’s Guide to Vue.js

Hands-on Vue.js for Beginners

Top 3 Mistakes That Vue.js Developers Make and Should be Avoided

Ember.js vs Vue.js - Which is JavaScript Framework Works Better for You

Vue.js Tutorial: Zero to Sixty



#javascript #vue-js

What is GEEK

Buddha Community

Using Slots In Vue.js
Aria Barnes

Aria Barnes

1625232484

Why is Vue JS the most Preferred Choice for Responsive Web Application Development?

For more than two decades, JavaScript has facilitated businesses to develop responsive web applications for their customers. Used both client and server-side, JavaScript enables you to bring dynamics to pages through expanded functionality and real-time modifications.

Did you know!

According to a web development survey 2020, JavaScript is the most used language for the 8th year, with 67.7% of people choosing it. With this came up several javascript frameworks for frontend, backend development, or even testing.

And one such framework is Vue.Js. It is used to build simple projects and can also be advanced to create sophisticated apps using state-of-the-art tools. Beyond that, some other solid reasons give Vuejs a thumbs up for responsive web application development.

Want to know them? Then follow this blog until the end. Through this article, I will describe all the reasons and benefits of Vue js development. So, stay tuned.

Vue.Js - A Brief Introduction

Released in the year 2014 for public use, Vue.Js is an open-source JavaScript framework used to create UIs and single-page applications. It has over 77.4 million likes on Github for creating intuitive web interfaces.

The recent version is Vue.js 2.6, and is the second most preferred framework according to Stack Overflow Developer Survey 2019.

Every Vue.js development company is widely using the framework across the world for responsive web application development. It is centered around the view layer, provides a lot of functionality for the view layer, and builds single-page web applications.

Some most astonishing stats about Vue.Js:

• Vue was ranked #2 in the Front End JavaScript Framework rankings in the State of JS 2019 survey by developers.

• Approximately 427k to 693k sites are built with Vue js, according to Wappalyzer and BuiltWith statistics of June 2020.

• According to the State of JS 2019 survey, 40.5% of JavaScript developers are currently using Vue, while 34.5% have shown keen interest in using it in the future.

• In Stack Overflow's Developer Survey 2020, Vue was ranked the 3rd most popular front-end JavaScript framework.

Why is Vue.Js so popular?

• High-speed run-time performance
• Vue.Js uses a virtual DOM.
• The main focus is on the core library, while the collaborating libraries handle other features such as global state management and routing.
• Vue.JS provides responsive visual components.

Top 7 Reasons to Choose Vue JS for Web Application Development

Vue js development has certain benefits, which will encourage you to use it in your projects. For example, Vue.js is similar to Angular and React in many aspects, and it continues to enjoy increasing popularity compared to other frameworks.

The framework is only 20 kilobytes in size, making it easy for you to download files instantly. Vue.js easily beats other frameworks when it comes to loading times and usage.

Take a look at the compelling advantages of using Vue.Js for web app development.

#1 Simple Integration

Vue.Js is popular because it allows you to integrate Vue.js into other frameworks such as React, enabling you to customize the project as per your needs and requirements.

It helps you build apps with Vue.js from scratch and introduce Vue.js elements into their existing apps. Due to its ease of integration, Vue.js is becoming a popular choice for web development as it can be used with various existing web applications.

You can feel free to include Vue.js CDN and start using it. Most third-party Vue components and libraries are additionally accessible and supported with the Vue.js CDN.

You don't need to set up node and npm to start using Vue.js. This implies that it helps develop new web applications, just like modifying previous applications.

The diversity of components allows you to create different types of web applications and replace existing frameworks. In addition, you can also choose to hire Vue js developers to use the technology to experiment with many other JavaScript applications.

#2 Easy to Understand

One of the main reasons for the growing popularity of Vue.Js is that the framework is straightforward to understand for individuals. This means that you can easily add Vue.Js to your web projects.

Also, Vue.Js has a well-defined architecture for storing your data with life-cycle and custom methods. Vue.Js also provides additional features such as watchers, directives, and computed properties, making it extremely easy to build modern apps and web applications with ease.

Another significant advantage of using the Vue.Js framework is that it makes it easy to build small and large-scale web applications in the shortest amount of time.

#3 Well-defined Ecosystem

The VueJS ecosystem is vibrant and well-defined, allowing Vue.Js development company to switch users to VueJS over other frameworks for web app development.

Without spending hours, you can easily find solutions to your problems. Furthermore, VueJs lets you choose only the building blocks you need.

Although the main focus of Vue is the view layer, with the help of Vue Router, Vue Test Utils, Vuex, and Vue CLI, you can find solutions and recommendations for frequently occurring problems.

The problems fall into these categories, and hence it becomes easy for programmers to get started with coding right away and not waste time figuring out how to use these tools.

The Vue ecosystem is easy to customize and scales between a library and a framework. Compared to other frameworks, its development speed is excellent, and it can also integrate different projects. This is the reason why most website development companies also prefer the Vue.Js ecosystem over others.

#4 Flexibility

Another benefit of going with Vue.Js for web app development needs is flexibility. Vue.Js provides an excellent level of flexibility. And makes it easier for web app development companies to write their templates in HTML, JavaScript, or pure JavaScript using virtual nodes.

Another significant benefit of using Vue.Js is that it makes it easier for developers to work with tools like templating engines, CSS preprocessors, and type checking tools like TypeScript.

#5 Two-Way Communication

Vue.Js is an excellent option for you because it encourages two-way communication. This has become possible with the MVVM architecture to handle HTML blocks. In this way, Vue.Js is very similar to Angular.Js, making it easier to handle HTML blocks as well.

With Vue.Js, two-way data binding is straightforward. This means that any changes made by the developer to the UI are passed to the data, and the changes made to the data are reflected in the UI.

This is also one reason why Vue.Js is also known as reactive because it can react to changes made to the data. This sets it apart from other libraries such as React.Js, which are designed to support only one-way communication.

#6 Detailed Documentation

One essential thing is well-defined documentation that helps you understand the required mechanism and build your application with ease. It shows all the options offered by the framework and related best practice examples.

Vue has excellent docs, and its API references are one of the best in the industry. They are well written, clear, and accessible in dealing with everything you need to know to build a Vue application.

Besides, the documentation at Vue.js is constantly improved and updated. It also includes a simple introductory guide and an excellent overview of the API. Perhaps, this is one of the most detailed documentation available for this type of language.

#7 Large Community Support

Support for the platform is impressive. In 2018, support continued to impress as every question was answered diligently. Over 6,200 problems were solved with an average resolution time of just six hours.

To support the community, there are frequent release cycles of updated information. Furthermore, the community continues to grow and develop with backend support from developers.



Wrapping Up

VueJS is an incredible choice for responsive web app development. Since it is lightweight and user-friendly, it builds a fast and integrated web application. The capabilities and potential of VueJS for web app development are extensive.

While Vuejs is simple to get started with, using it to build scalable web apps requires professionalism. Hence, you can approach a top Vue js development company in India to develop high-performing web apps.

Equipped with all the above features, it doesn't matter whether you want to build a small concept app or a full-fledged web app; Vue.Js is the most performant you can rely on.

Original source

 

#vue js development company #vue js development company in india #vue js development company india #vue js development services #vue js development #vue js development companies

NBB: Ad-hoc CLJS Scripting on Node.js

Nbb

Not babashka. Node.js babashka!?

Ad-hoc CLJS scripting on Node.js.

Status

Experimental. Please report issues here.

Goals and features

Nbb's main goal is to make it easy to get started with ad hoc CLJS scripting on Node.js.

Additional goals and features are:

  • Fast startup without relying on a custom version of Node.js.
  • Small artifact (current size is around 1.2MB).
  • First class macros.
  • Support building small TUI apps using Reagent.
  • Complement babashka with libraries from the Node.js ecosystem.

Requirements

Nbb requires Node.js v12 or newer.

How does this tool work?

CLJS code is evaluated through SCI, the same interpreter that powers babashka. Because SCI works with advanced compilation, the bundle size, especially when combined with other dependencies, is smaller than what you get with self-hosted CLJS. That makes startup faster. The trade-off is that execution is less performant and that only a subset of CLJS is available (e.g. no deftype, yet).

Usage

Install nbb from NPM:

$ npm install nbb -g

Omit -g for a local install.

Try out an expression:

$ nbb -e '(+ 1 2 3)'
6

And then install some other NPM libraries to use in the script. E.g.:

$ npm install csv-parse shelljs zx

Create a script which uses the NPM libraries:

(ns script
  (:require ["csv-parse/lib/sync$default" :as csv-parse]
            ["fs" :as fs]
            ["path" :as path]
            ["shelljs$default" :as sh]
            ["term-size$default" :as term-size]
            ["zx$default" :as zx]
            ["zx$fs" :as zxfs]
            [nbb.core :refer [*file*]]))

(prn (path/resolve "."))

(prn (term-size))

(println (count (str (fs/readFileSync *file*))))

(prn (sh/ls "."))

(prn (csv-parse "foo,bar"))

(prn (zxfs/existsSync *file*))

(zx/$ #js ["ls"])

Call the script:

$ nbb script.cljs
"/private/tmp/test-script"
#js {:columns 216, :rows 47}
510
#js ["node_modules" "package-lock.json" "package.json" "script.cljs"]
#js [#js ["foo" "bar"]]
true
$ ls
node_modules
package-lock.json
package.json
script.cljs

Macros

Nbb has first class support for macros: you can define them right inside your .cljs file, like you are used to from JVM Clojure. Consider the plet macro to make working with promises more palatable:

(defmacro plet
  [bindings & body]
  (let [binding-pairs (reverse (partition 2 bindings))
        body (cons 'do body)]
    (reduce (fn [body [sym expr]]
              (let [expr (list '.resolve 'js/Promise expr)]
                (list '.then expr (list 'clojure.core/fn (vector sym)
                                        body))))
            body
            binding-pairs)))

Using this macro we can look async code more like sync code. Consider this puppeteer example:

(-> (.launch puppeteer)
      (.then (fn [browser]
               (-> (.newPage browser)
                   (.then (fn [page]
                            (-> (.goto page "https://clojure.org")
                                (.then #(.screenshot page #js{:path "screenshot.png"}))
                                (.catch #(js/console.log %))
                                (.then #(.close browser)))))))))

Using plet this becomes:

(plet [browser (.launch puppeteer)
       page (.newPage browser)
       _ (.goto page "https://clojure.org")
       _ (-> (.screenshot page #js{:path "screenshot.png"})
             (.catch #(js/console.log %)))]
      (.close browser))

See the puppeteer example for the full code.

Since v0.0.36, nbb includes promesa which is a library to deal with promises. The above plet macro is similar to promesa.core/let.

Startup time

$ time nbb -e '(+ 1 2 3)'
6
nbb -e '(+ 1 2 3)'   0.17s  user 0.02s system 109% cpu 0.168 total

The baseline startup time for a script is about 170ms seconds on my laptop. When invoked via npx this adds another 300ms or so, so for faster startup, either use a globally installed nbb or use $(npm bin)/nbb script.cljs to bypass npx.

Dependencies

NPM dependencies

Nbb does not depend on any NPM dependencies. All NPM libraries loaded by a script are resolved relative to that script. When using the Reagent module, React is resolved in the same way as any other NPM library.

Classpath

To load .cljs files from local paths or dependencies, you can use the --classpath argument. The current dir is added to the classpath automatically. So if there is a file foo/bar.cljs relative to your current dir, then you can load it via (:require [foo.bar :as fb]). Note that nbb uses the same naming conventions for namespaces and directories as other Clojure tools: foo-bar in the namespace name becomes foo_bar in the directory name.

To load dependencies from the Clojure ecosystem, you can use the Clojure CLI or babashka to download them and produce a classpath:

$ classpath="$(clojure -A:nbb -Spath -Sdeps '{:aliases {:nbb {:replace-deps {com.github.seancorfield/honeysql {:git/tag "v2.0.0-rc5" :git/sha "01c3a55"}}}}}')"

and then feed it to the --classpath argument:

$ nbb --classpath "$classpath" -e "(require '[honey.sql :as sql]) (sql/format {:select :foo :from :bar :where [:= :baz 2]})"
["SELECT foo FROM bar WHERE baz = ?" 2]

Currently nbb only reads from directories, not jar files, so you are encouraged to use git libs. Support for .jar files will be added later.

Current file

The name of the file that is currently being executed is available via nbb.core/*file* or on the metadata of vars:

(ns foo
  (:require [nbb.core :refer [*file*]]))

(prn *file*) ;; "/private/tmp/foo.cljs"

(defn f [])
(prn (:file (meta #'f))) ;; "/private/tmp/foo.cljs"

Reagent

Nbb includes reagent.core which will be lazily loaded when required. You can use this together with ink to create a TUI application:

$ npm install ink

ink-demo.cljs:

(ns ink-demo
  (:require ["ink" :refer [render Text]]
            [reagent.core :as r]))

(defonce state (r/atom 0))

(doseq [n (range 1 11)]
  (js/setTimeout #(swap! state inc) (* n 500)))

(defn hello []
  [:> Text {:color "green"} "Hello, world! " @state])

(render (r/as-element [hello]))

Promesa

Working with callbacks and promises can become tedious. Since nbb v0.0.36 the promesa.core namespace is included with the let and do! macros. An example:

(ns prom
  (:require [promesa.core :as p]))

(defn sleep [ms]
  (js/Promise.
   (fn [resolve _]
     (js/setTimeout resolve ms))))

(defn do-stuff
  []
  (p/do!
   (println "Doing stuff which takes a while")
   (sleep 1000)
   1))

(p/let [a (do-stuff)
        b (inc a)
        c (do-stuff)
        d (+ b c)]
  (prn d))
$ nbb prom.cljs
Doing stuff which takes a while
Doing stuff which takes a while
3

Also see API docs.

Js-interop

Since nbb v0.0.75 applied-science/js-interop is available:

(ns example
  (:require [applied-science.js-interop :as j]))

(def o (j/lit {:a 1 :b 2 :c {:d 1}}))

(prn (j/select-keys o [:a :b])) ;; #js {:a 1, :b 2}
(prn (j/get-in o [:c :d])) ;; 1

Most of this library is supported in nbb, except the following:

  • destructuring using :syms
  • property access using .-x notation. In nbb, you must use keywords.

See the example of what is currently supported.

Examples

See the examples directory for small examples.

Also check out these projects built with nbb:

API

See API documentation.

Migrating to shadow-cljs

See this gist on how to convert an nbb script or project to shadow-cljs.

Build

Prequisites:

  • babashka >= 0.4.0
  • Clojure CLI >= 1.10.3.933
  • Node.js 16.5.0 (lower version may work, but this is the one I used to build)

To build:

  • Clone and cd into this repo
  • bb release

Run bb tasks for more project-related tasks.

Download Details:
Author: borkdude
Download Link: Download The Source Code
Official Website: https://github.com/borkdude/nbb 
License: EPL-1.0

#node #javascript

Luna  Mosciski

Luna Mosciski

1600583123

8 Popular Websites That Use The Vue.JS Framework

In this article, we are going to list out the most popular websites using Vue JS as their frontend framework.

Vue JS is one of those elite progressive JavaScript frameworks that has huge demand in the web development industry. Many popular websites are developed using Vue in their frontend development because of its imperative features.

This framework was created by Evan You and still it is maintained by his private team members. Vue is of course an open-source framework which is based on MVVM concept (Model-view view-Model) and used extensively in building sublime user-interfaces and also considered a prime choice for developing single-page heavy applications.

Released in February 2014, Vue JS has gained 64,828 stars on Github, making it very popular in recent times.

Evan used Angular JS on many operations while working for Google and integrated many features in Vue to cover the flaws of Angular.

“I figured, what if I could just extract the part that I really liked about Angular and build something really lightweight." - Evan You

#vuejs #vue #vue-with-laravel #vue-top-story #vue-3 #build-vue-frontend #vue-in-laravel #vue.js

sophia tondon

sophia tondon

1618971133

Top 10 VueJS Development Companies To Know In 2021-22

Vue.js is one of the most used and popular frontend development, or you can say client-side development framework. It is mainly used to develop single-page applications for both web and mobile. Famous companies like GitLab, NASA, Monito, Adobe, Accenture are currently using VueJS.

Do You Know?

Around 3079 companies reportedly use Vue.js in their tech stacks.
At GitHub, VueJS got 180.9K GitHub stars, including 28.5K GitHub forks.
Observing the increasing usage of VueJS and its robust features, various industry verticals are preferring to develop the website and mobile app Frontend using VueJS, and due to this reason, businesses are focusing on hiring VueJS developers from the top Vue.js development companies.

But the major concern of the enterprises is how to find the top companies to avail leading VueJS development service? Let’s move further and know what can help you find the best VueJS companies.

Read More - https://www.valuecoders.com/blog/technology-and-apps/top-10-vuejs-development-companies/

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Top VueJS App Development Company in USA

AppClues Infotech is the best & most reliable VueJS App Development Company in USA that builds high-quality and top-notch mobile apps with advanced methodology. The company is focused on providing innovative & technology-oriented solutions as per your specific business needs.

The organization’s VueJS developers have high experience and we have the capability of handling small to big projects. Being one of the leading mobile app development company in USA we are using the latest programming languages and technologies for their clients.

Key Elements:

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VueJS Development Services by AppClues Infotech

· Custom VueJS Development

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Why Hire VueJS Developers from AppClues Infotech?

· Agile & Adaptive Development

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If you have any project ideas for VueJS app development then share your requirements with AppClues Infotech to get the best solution for your dream projects.

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**

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