Marcelle  Smith

Marcelle Smith

1595491828

An Introduction to Angular: The Remarkable JS Framework

Javascript frameworks have nowadays become the most popular and most-used web app development solution. Because there are a plethora of app development frameworks available, it becomes challenging to choose the best one.

In case you too are planning to develop an application but unable to decide which framework to use, try using Angular.

Angular is one of the most exciting technologies for web app development. Angular is a structural framework used to develop dynamic web apps. It was introduced by Google corporation in 2012 and is built keeping in mind the Model-View-Controller concept. It is a framework adopted by fast-growing startups as well as large enterprises more often. Not only the framework is awesome, but it also has a very steep learning curve!

The best part of using Angular is that it lets you use HTML as the template language whose syntax can be extended to express your application components clearly.

Several versions of Angular have been released till now starting from Angular 1.x to Angular 8.0.

Angular 1.x was initially introduced as a basic framework without keeping in mind the mobile support. Introduction of Angular 2 was a blessing for developers because of its amazing features and functionalities. Most people think it is an upgrade of Angular 1 but it is not, it is completely rewritten. It is mobile-oriented and provides more choice of languages that Angular 1.x. In fact, multiple languages can be used to write Angular 2 code such as ES5, ES6, Dart, and TypeScript.

After so many versions and upgrades being introduced such as Angular 2, 4, 5, 6, 7, Angular 8 version is going to get released soon this year and is expected to bring a lot of modifications which will make the app development process much easier and convenient for the developers.

1. Why Angular is so Popular for Web App Development?

The wide range of functionalities, features, and benefits makes Angular one of the most preferred frameworks for application development. The best thing about using Angular is that it is capable of developing single-page applications using a set of ready-to-use modules.

Despite of having countless plugins and frameworks available on the marketplace, most of the website owners pick AngularJS for web or mobile app development.

Why?

Because of its simplicity, reusable code, and amazing features. Moreover, AngularJS has been ranked one of the top-most frameworks by GitHub.

However, to make the best use of the Angular Framework, it is recommended to hire Angular app development companies as they have full-fledged knowledge of the framework as well as the tools associated with it.

2. What are the Building Blocks of Angular?

The building blocks of Angular includes NgModules, Components, and Services and Dependency injection.

  • An angular app is entirely defined by NgModule that are responsible for collecting related code into functional sets.
  • A root module enables bootstrapping and consists of several featured modules.
  • Components, on the other hand, are the sets of screen elements for Angular to modify your program logic and data. These components use services to provide specific functionality and can be injected as dependencies into components making the code more reusable, modular, and efficient.

Let’s understand in detail about the building blocks of the Angular framework.

#angularjs #js framework #programming #development #javascript #website development

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Buddha Community

An Introduction to Angular: The Remarkable JS Framework

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

Benefits of Angular JS based Applications

AngularJS was introduced in the year 2009, by Google. AngularJS is a software framework used worldwide by developers. The entire base of this framework is open source. AngularJS has gained popularity among developers because of how it has become for them to create web applications. AngularJS helps in building apps that require less work and reduces the use of unnecessary codes. AngularJS application development is a javascript framework. AngularJS has a clear goal to make the entire process simpler, it also helps app development process and operations as much as it could. AngularJS is used for building applications that support MVC (model view controller) and SPAs (single page web apps) coding and programming structures. AngularJS has been used by some of the top companies in the world to simplify their app development process, like, Google, Paypal, Udemy, mobile site in iPad for HBO, etc. To read more click on the link.

#hire angular js developer #hire dedicated angular js developer #angular js application development #hire dedicated angular js team #hire best angular js application developer

Why Choose Angular JS Development for Perfect Web Apps Development?

AngularJS is a JavaScript framework, this was developed by Google. IT is an open-source framework. AngularJS is responsible for handling all the activities and interactive elements on a web page. The main purpose of this framework is to develop applications for one single page. Angular JS highlights the testability process and the quality of codes for web pages. This is one of the main reasons why so many developers prefer this framework over others. Angular JS frameworks have been used in some of the top software development companies.The demand for AngularJS has been growing in all industries. This software system is fast and has helped solve the errors and mistakes of website projects. You can easily hire Angular JS developers team from the market or hire a freelancer for your work. Angular JS is the fastest and easiest framework of JavaScript to integrate with other frameworks. If you hire AngularJS developer you can easily make any kind of front-end website development easy. Why should you choose Angular JS for developing your web application? The main reason is that AngularJS has a lot of benefits, these will help you develop the best quality app. To read more click on the link.

#hire angular js developer #hire dedicated angular js developer #angular js application development #hire dedicated angular js team #hire best angular js application developer #website developer

Custom AngularJS Web App Development Company in USA

Looking for the best custom AngularJS app development company? AppClues Infotech is a top-rated AngularJS app development company in USA producing robust, highly interactive and data-driven AngularJS web and mobile applications with advanced features & technologies.

For more info:
Website: https://www.appcluesinfotech.com/
Email: info@appcluesinfotech.com
Call: +1-978-309-9910

#custom angular js web app development company in usa #best angular js app development company in usa #hire angular js app developers in usa #top angular js app development company #professional angular js app developers #leading angular js app development agency

sophia tondon

sophia tondon

1620185049

Angular.JS vs Node.JS || Find the best for your project

Whether MNCs or Startups, many companies use Angular.JS or Node.JS to develop web applications as these are among the best JavaScript frameworks used for web applications.

According to Statista, Node.JS and Angular.JS are the best frameworks used by developers, with 51.4% and 25.1%, respectively.

Both these frameworks have unique features and advantages, which makes them preferred over the other frameworks.

Many enterprises use these frameworks without even understanding their uniqueness and the type of projects they are suited or made, which is why, today, I will compare some of the best features and advantages of these two frameworks.

Blog Link -https://www.valuecoders.com/blog/technology-and-apps/angular-js-vs-node-js-find-the-best-for-your-project/

##angular developer #angular js developer #angular js developers #angularvsnode #hire angular js developers #node js developer