Ilaria  Dugg

Ilaria Dugg

1570179696

Keeping your Vue.js code Clean

ES6 was a big step forward for the web, and it introduced many new features that solve various pain points that exist for all JavaScript developers. But a few of its features are specifically suited to solve problems that arise when developing with Vue.js. This article will cover four of those Vue-specific features. We’ll look at how each feature works and what problem it solves for your apps and websites. Without further ado, let’s dive in!

Feature #1: Method definition shorthand

This first feature I want to talk about has a purely aesthetic effect, but it really helps to make your code as readable as possible. ES6 introduced this shorthand to more succinctly assign functions to objects, which we do all the time in Vue for methods, computed properties, watchers, and lifecycle methods. Here’s an example of how you can apply it to your Vue code:

},
	computed: {
		halfValue: function() { // ... }
	},
	created: function() { // ... }
}

// With ES6 shorthand
{
	methods: {
		getValue() { // ... }
	},
	computed: {
		halfValue() { // ... }
	},
	created() { // ... }
}

Again, this is a small change, but it can make a big difference for readability.

Feature #2: Destructuring

Destructuring is a feature added in ES6 that makes it easier to pull properties out of an object and assign them to a variable. Before we get into how this helps us in our Vue code, here’s a very basic example of how object destructuring works:

const person = { name: 'Jake', email: 'jake@example.com', phone: '555-555-5555' }

// With destructuring
const { name, email, phone } = person

// Without destructuring
const name = person.name
const email = person.email
const phone = person.phone

The two examples above (with/without destructuring) work exactly the same. The version using destructuring is just a cleaner code pattern to achieve the same result.

So how can you use destructuring in your Vue codebases? There are two main areas where destructuring shines in Vue: destructuring properties from this, and receiving props from scoped slots. Let’s walk through each of those use cases.

Destructuring from this

In Vue, to reference data, methods, or anything on the Vue or your component instance, you use this. But sometimes it’s nice to access those instance properties without referring to this over and over again. Let me show you a nice little trick to pull properties from this into your local function scope:

data() {
	return {
		endpoint: 'example.com/api',
	}
},
methods: {
	postForm() { // this is just an example method we can call in submitForm }
	submitForm() {
		// Without destructuring
		const endpoint = this.endpoint
		const postForm = this.postForm

		// With destructuring
		const { endpoint, postForm } = this
  }
}

This pattern allows us not only to use these variables without the this prefix, it also gives us clarity on which pieces of data and/or methods that our function relies on.

Scoped slots

Slots allow us to pass templates into our components, and scoped slots allow our components to provide some component data to those templates. If you’re not familiar with scoped slots, this might not make as much sense, but hopefully this example can at least reinforce how destructuring works and how you can use it in many different scenarios:

<!-- Without Destructuring -->
<User v-slot="slotProps">
	<div>Name: {{ slotProps.name }}</div>
	<div>Email: {{ slotProps.email }}</div>
</User>

<!-- With Destructuring -->
<User v-slot="{ name, email }">
	<div>Name: {{ name }}</div>
	<div>Email: {{ email }}</div>
</User>

Not unlike the “destructuring from this” pattern, not only does destructuring our slot props allow us to access our variables without using the slotProps prefix, but it shows us exactly what properties we are accepting through the slot.

Feature #3: Functional array methods

ES6 introduced many new methods built into the Array prototype. These methods allow you to interact with the data in your arrays in different ways, like transforming each item (map), sorting an array, or filtering an array. My favorite array methods that I use commonly in Vue apps are filter, map, forEach, and includes. Here’s an example using filter:

computed: {
	// Without "filter" functional array method
	oldFilteredItems() {
		const filtered = []
		for (const item in this.items) {
			if(item.value > 10) {
				filtered.push(item)
			}
		}
		return filtered
	},
	// With "filter" functional array method
	filteredItems() {
		return this.items.filter((item) => item.value > 10)
	}
}

This reduces the code we have to write (and read!) from seven lines to only one!

Feature #4: Arrow functions

Before we learn about arrow functions, how they work, and how to use them in your Vue code, let’s look at the problem they solve. Check out the following code:

data() {
	return {
		scrolled: false
	}
},
mounted() {
	window.addEventListener('scroll', function() {
		this.scrolled = true
	})
}

This code doesn’t work. Why? Because when you create a new function, the value of this is re-bound to equal the function instance instead of the Vue instance. If you’ve ever run into this problem, you may have tried the following approach to fix this problem:

mounted() {
	var self = this
	window.addEventListener('scroll', function() {
		self.scrolled = true
	})
}

While this does “fix” the problem, it is definitely not ideal to have var self = this littered around your code, especially when this is a solvable problem with (drumroll please) … arrow functions!

Arrow functions are very similar to standard functions, but one key difference is that arrow functions don’t re-bind this, which is very helpful in Vue apps! Here’s an updated version of the earlier example, wherein we’ve replaced the standard function with an arrow function so this doesn’t get re-bound:

mounted() {
	window.addEventListener('scroll', () => {
		this.scrolled = true
	})
}

Here is a rule that I find helpful to follow when writing Vue apps: within Vue components, this should always refer to the Vue instance. This isn’t hard to achieve if you use arrow functions, and it makes your code easier to understand.

If you’re not familiar with arrow functions, they’re definitely worth learning. While they’re especially useful in this scenario, they also allow you to write much more succinct functions, which is applicable to many more scenarios. One other place they’re beneficial is paired with array methods! If you look at my filteredItems function in Feature #4, you can see I used an arrow function as the first argument of the filter array method!

Wrapping up

Before I sign off, I want to talk about how I went about identifying these four improvements, and how you can learn to spot places that could use improvement in your codebase(s). Here are a few tips!

Look for repetition

Not all repetition is bad, but seeing anything repeated throughout your code should have you wondering if there is an opportunity for a good abstraction, or to learn a new pattern or language feature that solves the problem you’re working around.

Be aware of language changes

It would be impossible to know that you can simplify many of the loops in your code by using array methods if you didn’t keep up with the changes to JavaScript. That said, you don’t have to “dive deep” into every new thing, but try to have an awareness of what is available in the language you’re working with. Then, when you encounter a problem, hopefully you will be reminded of a language feature that solves the problem you’re facing.

Read other people’s code

If you work on a team, ask to review someone else’s code with them, or ask them to review yours. Seeing other people’s code, or their comments on yours, will allow you to learn how others do things differently. And when you see a code pattern you don’t recognize, figure out what it is and, if it makes sense, apply it to your code.

Thank you !

#vue-js #es6 #javascript #web-development

What is GEEK

Buddha Community

Keeping your Vue.js code Clean
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

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

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:

· Total year of experience - 8+

· Employees Strength - 120+

· Hourly Rate - $25 – $45 / hr

· Location - New York, USA

· Successfully launched projects - 450+

VueJS Development Services by AppClues Infotech

· Custom VueJS Development

· Portal Development Solutions

· Web Application Development

· VueJS Plugin Development

· VueJS Ecommerce Development

· SPA (Single Page App) Development

· VueJS Migration

Why Hire VueJS Developers from AppClues Infotech?

· Agile & Adaptive Development

· 8+ Years of Average Experience

· 100% Transparency

· Guaranteed Bug-free VueJS Solution

· Flexible Engagement Models

· On-Time Project Delivery

· Immediate Technical Support

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.

For more info:
Share Yoru Requirements: https://www.appcluesinfotech.com/contact-us/
Email: info@appcluesinfotech.com
Call: +1-978-309-9910
**

#top vue.js development company #vue.js app development company #best vue js development company #hire top vue js developers #hire top vue.js developers in usa #vue js development company usa