John David

John David

1560828616

Vue.js Tutorial for beginners

In this tutorial, you are going to learn the basics of Vue.js. While we learn, we are going to build a Todo app that will help us to put in practice what we learn.

A good way to learn a new framework, It’s by doing a Todo app. It’s an excellent way to compare framework features. It’s quick to implement and easy to understand. However, don’t be fooled by the simplicity, we are going to take it to the next level. We are going to explore advanced topics as well such as Vue Routing, Components, directives and many more!

Let’s first setup the dev environment, so we can focus on Vue! 🖖

1. Setup

We are going to start with essential HTML elements and CSS files and no JavaScript. You will learn how to add all the JavaScript functionality using Vue.js.

To get started quickly, clone the following repo and check out the start-here branch:

git clone https://github.com/amejiarosario/vue-todo-app.git
cd vue-todo-app
git checkout start-here

npm install
npm start

After running npm start, your browser should open on port [http://127.0.0.1:8080](http://127.0.0.1:8080 "http://127.0.0.1:8080") and show the todo app.

Try to interact with it. You cannot create a new Todos, nor can you delete them or edit them. We are going to implement that!

Open your favorite code editor (I recommend Code) on vue-todo-app directory.

1.1 Package.json

Take a look at the package.json dependencies:

"dependencies": {
  "todomvc-app-css": "2.1.2",
  "vue": "2.5.17",
  "vue-router": "3.0.1"
},
"devDependencies": {
  "live-server": "1.2.0"
}

We installed Vue and VueRouter dependencies. Also, we have the nice CSS library for Todo apps and live-server to serve and reload the page when we make changes. That’s all we would need for this tutorial.

1.2 Index.html

Open the index.html file. There we have the basic HTML structure for the Todo app that we are going to build upon:

  • Line 9: Loads the CSS from NPM module node_modules/todomvc-app-css/index.css.
  • Line 23: We have the ul and some hard-coded todo lists. We are going to change this in a bit.
  • Line 73: we have multiple script files that load Vue, VueRouter and an empty app.js.

Now, you know the basic structure where we are going to work on. Let’s get started with Vue! 🖖

2. Getting started with Vue

As you might know…

Vue.js is a reactive JavaScript framework to build UI components.
It’s reactive because the data and the DOM are linked. That means, that when data changes, it automatically updates the DOM. Let’s try that!

2.1 Vue Data & v-text

Go to app.js and type the following:

const todoApp = new Vue({
  el: '.todoapp',
  data: {
    title: 'Hello Vue!'
  }
});

The el is the element where Vue is going to be mounted. If you notice in the index.html that’s the section part. The data object is reactive. It keeps track of changes and re-render the DOM if needed. Go to the index page and change <h1>todos</h1> for <h1>{{ title }}</h1>. The rest remains the same:

<section class="todoapp">
  <header class="header">
    <h1>{{ title }}</h1>
    <input class="new-todo" placeholder="What needs to be done?" autofocus>
  </header>
  <!--  ...  -->

If you have npm start running you will see that the title changed!

You can also go to the console and change it todoApp.title = "Bucket List" and see that it updates the DOM.

Note: besides the curly braces you can also use v-text:

<h1 v-text="title"></h1>

Let’s do something useful and put an initial todo list:

const todoApp = new Vue({
  el: '.todoapp',
  data: {
    title: 'Todos',
    todos: [
      { text: 'Learn JavaScript ES6+ goodies', isDone: true },
      { text: 'Learn Vue', isDone: false },
      { text: 'Build something awesome', isDone: false },
    ],
  }
});

Now that we have the list we need to replace the <li> elements with each of the elements in the data.todos array.

Let’s do the CRUD (Create-Read-Update-Delete) of a Todo application.

review diff

2.2 READ: List rendering with v-for

As you can see everything starting with v- is defined by the Vue library.

We can iterate through elements using v-for as follows:

<li v-for="todo in todos">
  <div class="view">
    <input class="toggle" type="checkbox">
    <label>{{todo.text}}</label>
    <button class="destroy"></button>
  </div>
  <input class="edit" value="Rule the web">
</li>

You can remove the other <li> tag that was just a placeholder.

review diff

2.3 CREATE Todo and event directives

We are going to implement the create functionality. We have a textbox, and when we press enter, we would like to add whatever we typed to the list.

In Vue, we can listen to an event using v-on:EVENT_NAME. E.g.:

  • Line 9: Loads the CSS from NPM module node_modules/todomvc-app-css/index.css.
  • Line 23: We have the ul and some hard-coded todo lists. We are going to change this in a bit.
  • Line 73: we have multiple script files that load Vue, VueRouter and an empty app.js.

Protip: since v-on: is used a lot, there’s a shortcut @. E.g. Instead of v-on:keyup.enter it can be [```@keyup.enter](mailto:```@keyup.enter)`.

Let’s use the keyup.enter to create a todo:

<input class="new-todo" placeholder="What needs to be done?"
  v-on:keyup.enter="createTodo"
  autofocus>

On enter we are calling createTodo method, but it’s not defined yet. Let’s define it on app.js as follows:

methods: {
  createTodo(event) {
    const textbox = event.target;
    this.todos.push({ text: textbox.value, isDone: false });
    textbox.value = '';
  }
}

review diff

2.4 Applying classes dynamically & Vue v-bind

If you click the checkbox (or checkcirlcle) we would like the class completed to be applied to the element. We can accomplish this by using the v-bind directive.

v-bind can be applied to any HTML attribute such as class, title and so forth. Since v-bind is used a lot we can have a shortcut :, so instead of v-bind:class it becomes :class.

<li v-for="todo in todos" :class="{ completed: todo.isDone }">

Now if a Todo list is completed, it will become cross out. However, if we click on the checkbox, it doesn’t update the isDone property. Let’s fix that next.

review diff

2.5 Keep DOM and data in sync with Vue v-model

The todos have a property called isDone if it’s true we want the checkbox to be marked. That’s data -> DOM. We also want if we change the DOM (click the checkbox) we want to update the data (DOM -> data). This bi-directional communication is easy to do using v-model, it will keep it in sync for you!

<input class="toggle" type="checkbox" v-model="todo.isDone">

If you test the app now, you can see when you click the checkbox; also the text gets cross out. Yay!

You can also go to the console and verify that if you change the data directly, it will immediately update the HTML. Type the following in the browser console where you todo app is running:

todoApp.todos[2].isDone = true

You should see the update. Cool!

2.6 UPDATE todo list with a double-click

We want to double click on any list and that it automatically becomes a checkbox. We have some CSS magic to do that, the only thing we need to do is to apply the editing class.

<!-- List items should get the class `editing` when editing and `completed` when marked as completed -->
<li v-for="todo in todos" :class="{ completed: todo.isDone }">
  <div class="view">
    <input class="toggle" type="checkbox" v-model="todo.isDone">
    <label>{{todo.text}}</label>
    <button class="destroy"></button>
  </div>
  <input class="edit" value="Rule the web">
</li>

Similar to what we did with the completed class, we need to add a condition when we start editing.

Starting with the label, we want to start editing when we double-click on it. Vue provides v-on:dblclick or shorthand @dblclick:

<label @dblclick="startEditing(todo)">{{todo.text}}</label>

In the app.js we can define start editing as follows:

const todoApp = new Vue({
  el: '.todoapp',
  data: {
    title: 'Todos',
    todos: [
      { text: 'Learn JavaScript ES6+ goodies', isDone: true },
      { text: 'Learn Vue', isDone: false },
      { text: 'Build something awesome', isDone: false },
    ],
    editing: null,
  },
  methods: {
    createTodo(event) {
      const textbox = event.target;
      this.todos.push({ text: textbox.value, isDone: false });
      textbox.value = '';
    },
    startEditing(todo) {
      this.editing = todo;
    },
  }
});

We created a new variable editing in data. We just set whatever todo we are currently editing. We want only to edit one at a time, so this works perfectly. When you double-click the label, the startEditing function is called and set the editing variable to the current todo element.

Next, we need to apply the editing class:

<li v-for="todo in todos" :class="{ completed: todo.isDone, editing: todo === editing }">

When data.editing matches the todo , then we apply the CSS class. Try it out!

If you try it out, you will notice you can enter on edit mode, but there’s no way to exit from it (yet). Let’s fix that.

<input class="edit"
  @keyup.esc="cancelEditing"
  @keyup.enter="finishEditing"
  @blur="finishEditing"
  :value="todo.text">

First, we want the input textbox to have the value of the todo.text when we enter to the editing mode. We can accomplish this using :value="todo.text". Remember that colon : is a shorthand for v-bind.

Before, we implemented the startEditing function. Now, we need to complete the edit functionality with these two more methods:

  • Line 9: Loads the CSS from NPM module node_modules/todomvc-app-css/index.css.
  • Line 23: We have the ul and some hard-coded todo lists. We are going to change this in a bit.
  • Line 73: we have multiple script files that load Vue, VueRouter and an empty app.js.

Let’s go to the app.js and define these two functions.

finishEditing(event) {
  if (!this.editing) { return; }
  const textbox = event.target;
  this.editing.text = textbox.value;
  this.editing = null;
},
cancelEditing() {
  this.editing = null;
}

Cancel is pretty straightforward. It just set editing to null.

finishEditing will take the input current’s value (event.target.value) and copy over the todo element that is currently being edited. That’s it!

review diff

2.7 DELETE todo list on @click event

Finally, the last step to complete the CRUD operations is deleting. We are going to listen for click events on the destroy icon:

<button class="destroy" @click="destroyTodo(todo)"></button>

also, destroyTodo implementation is as follows:

destroyTodo(todo) {
  const index = this.todos.indexOf(todo);
  this.todos.splice(index, 1);
},

review diff

2.8 Trimming inputs

It’s always a good idea to trim user inputs, so any accidental whitespace doesn’t get in the way with textbox.value.trim().

review diff

2.9 Items left count with computed properties

Right now the item left count is always 0. We want the number of remaining tasks. We could do something like this:

<strong>{{ todos.filter(t => !t.isDone).length }}</strong> item(s) left</span>

That’s a little ugly to stick out all that logic into the template. That’s why Vue has the computed section!

computed: {
  activeTodos() {
    return this.todos.filter(t => !t.isDone);
  }
}

Now the template is cleaner:

	

<strong>{{ activeTodos.length }}</strong> item(s) left</span>

You might ask, why use a computed property when we can create a method instead?

Vue.js is a reactive JavaScript framework to build UI components.
Try completing other tasks and verify that the count gets updated.

review diff

2.10 Clearing completed tasks & conditional rendering with v-show

We want to show clear completed button only if there are any completed task. We can accomplish this with the v-show directive:

<button class="clear-completed" @click="clearCompleted" v-show="completedTodos.length">Clear completed</button>

The v-show will hide the element if the expression evaluates to false or 0.

One way to clearing out completed tasks is by assigning the activeTodos property to the todos:

clearCompleted() {
  this.todos = this.activeTodos;
}

Also, we have to add the computed property completedTodos that we use in the v-show

completedTodos() {
  return this.todos.filter(t => t.isDone);
}

review diff

3. Vue Conditional Rendering: v-show vs v-if

v-show and v-if looks very similar, but they work differently. v-if removes the element from the DOM and disable events, while v-show hides it with the CSS display: none;. So, v-if is more expensive than v-show.

Vue.js is a reactive JavaScript framework to build UI components.
We can hide the footer and central section if there’s no todo list.

<section class="main" v-if="todos.length">... </section>
<footer class="footer" v-if="todos.length">...</footer>

review diff

4. Local Storage

On every refresh, our list gets reset. This is useful for dev but not for users. Let’s persist our Todos in the local storage.

Vue.js is a reactive JavaScript framework to build UI components.
The way localStorage works is straightforward. It is global variable and has only 4 methods:

  • Line 9: Loads the CSS from NPM module node_modules/todomvc-app-css/index.css.
  • Line 23: We have the ul and some hard-coded todo lists. We are going to change this in a bit.
  • Line 73: we have multiple script files that load Vue, VueRouter and an empty app.js.

We are going to use getItem and setItem. First we need to define a storage key:

const LOCAL_STORAGE_KEY = 'todo-app-vue';

Then we replace data.todos to get items (if any) from the local storage:

data: {
  title: 'Todos',
  todos: JSON.parse(localStorage.getItem(LOCAL_STORAGE_KEY)) || [
    { text: 'Learn JavaScript ES6+ goodies', isDone: true },
    { text: 'Learn Vue', isDone: false },
    { text: 'Build something awesome', isDone: false },
  ],
  editing: null,
},

We have to use JSON.parse because everything gets stored as a string and we need to convert it to an object.

getItem will retrieve the saved todos from the localstorage. However, we are saying it yet. Let’s see how we can do that.

5. Vue Watchers

For saving, we are going to use the Vue watchers.

Vue.js is a reactive JavaScript framework to build UI components.

watch: {
  todos: {
    deep: true,
    handler(newValue) {
      localStorage.setItem(LOCAL_STORAGE_KEY, JSON.stringify(newValue));
    }
  }
},

This expression watches for changes in our todos data. Deep means that it recursively watches for changes in the values inside arrays and objects. If there’s a change, we save them to the local storage.

review diff

Once you change some todos, you will see they are stored in the local storage. You can access them using the browser’s dev tools:

The last part to implement is the routing! However, for that, we need to explain some more concepts and will do that in the next post.

In the next tutorial, we are going to switch gears a little bit and go deeper into Vue Components, Routing, and Local Storage. Stay tuned!

6. Summary: Vue cheatsheet

We learned a lot!

#vue-js #javascript

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Vue.js Tutorial for beginners

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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

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/

#hire vue js developer #hire vue.js developers #hire vue.js developer, #hire vue.js developers, #vue js development company #vue.js development company

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