Cómo crear una aplicación Crud usando Laravel y Vue.JS

En este tutorial, aprenderá cómo crear una aplicación crud usando el marco Laravel 8 + vue js. Además, aprenderá cómo crear API crud en laravel para la aplicación de ejemplo Vue.Js spa crud en Laravel.

1: Instalar la aplicación Laravel 8

En primer lugar, abra su terminal y ejecute el siguiente comando para descargar la nueva configuración de laravel para crear la aplicación de ejemplo laravel 8 vue js crud:

composer create-project --prefer-dist laravel/laravel blog

2: Conexión de la aplicación a la base de datos

Ahora, debe visitar el directorio raíz de la aplicación laravel 8 descargado y abrir el archivo .env. Luego agregue los detalles de la base de datos de la siguiente manera:

DB_CONNECTION=mysql 
DB_HOST=127.0.0.1 
DB_PORT=3306 
DB_DATABASE=here your database name here
DB_USERNAME=here database username here
DB_PASSWORD=here database password here

3: Instalar dependencias NPM

En este paso, ejecute el siguiente comando en la terminal para instalar las dependencias de la interfaz:

npm install

A continuación, instale  vue-router  y  vue-axios . vue-axios se usará para llamar a la API de Laravel. ejecute el siguiente comando en su símbolo del sistema:

npm install vue-router vue-axios --save

Después de instalar todas las dependencias, ejecute este comando en la terminal:

npm run watch

Este  npm run watch comando escuchará los cambios en los archivos y compilará los activos al instante. También puede ejecutar este npm run devcomando en la terminal. No escuchará los cambios de archivos.

4: Crear Migración, Modelo y Controlador

Crear modelo Post, migración y controlador. Así que ejecuta el siguiente comando en la terminal para eso:

php artisan make:model Post -m

Ahora abra el archivo de migración create_posts_table.php desde  base de datos>migraciones  y reemplace  la función up()  con esto:create_posts_table.php

public function up()
{
    Schema::create('posts', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->string('title');
        $table->text('description');
        $table->timestamps();
    });
}

Migre la base de datos usando el siguiente comando:

php artisan migrate

Ahora, abra el archivo del modelo Post.php , que se encuentra dentro del directorio app/models  y actualice el código en el modelo Post.php :

<?php
 
namespace App\Models;
 
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
 
class Post extends Model
{
    use HasFactory;
 
    protected $fillable = [
        'title', 'description'
    ];
}

Ahora, abra su terminal y ejecute el siguiente comando para crear el archivo PostController.php:

php artisan make:controller API\PostController

A continuación, abra PostController y defina índice, agregue, edite, elimine métodos en el archivo PostController . Así que vaya a la carpeta app>Http>Controllers>API  y abra el archivo PostController.php . Luego actualice el siguiente método en esto:

<?php
 
namespace App\Http\Controllers\API;
 
use App\Http\Controllers\Controller;
 
use App\Models\Post;
 
use Illuminate\Http\Request;
 
use Validator;
 
class PostController extends Controller
{
    // all posts
    public function index()
    {
        $posts = Post::all()->toArray();
        return array_reverse($posts);
    }
 
    // add post
    public function add(Request $request)
    {
        $post = new Post([
            'title' => $request->input('title'),
            'description' => $request->input('description')
        ]);
        $post->save();
 
        return response()->json('The post successfully added');
    }
 
    // edit post
    public function edit($id)
    {
        $post = Post::find($id);
        return response()->json($post);
    }
 
    // update post
    public function update($id, Request $request)
    {
        $post = Post::find($id);
        $post->update($request->all());
 
        return response()->json('The post successfully updated');
    }
 
    // delete post
    public function delete($id)
    {
        $post = Post::find($id);
        $post->delete();
 
        return response()->json('The post successfully deleted');
    }
}

 

5: Definir rutas en Web.php

Ahora defina rutas en el archivo de rutas web.php y api.php. Así que vaya a la carpeta Rutas y  abra el archivo web.php  y Api.php y actualice las siguientes rutas:

Rutas/web.php

<?php
 
Route::get('{any}', function () {
    return view('layouts.app');
})->where('any', '.*');

Ahora abra el archivo api.php y agregue las siguientes rutas en él:

Route::get('posts', 'PostController@index');
Route::group(['prefix' => 'post'], function () {
    Route::post('add', 'PostController@add');
    Route::get('edit/{id}', 'PostController@edit');
    Route::post('update/{id}', 'PostController@update');
    Route::delete('delete/{id}', 'PostController@delete');
});

6: Crear la aplicación Vue Js

En este paso, vaya a recursos/vistas y cree una carpeta llamada diseños . Dentro de esta carpeta, cree un archivo de vista de hoja llamado archivo app.blade.php .

A continuación, navegue a recursos/vistas/diseños y abra el archivo app.blade.php . Luego actualice el siguiente código en su archivo app.blade.php de la siguiente manera:

<!doctype html>
<html lang="{{ str_replace('_', '-', app()->getLocale()) }}">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="csrf-token" value="{{ csrf_token() }}"/>
    <title>Laravel 8 Vue JS CRUD Example  - Tutsmake</title>
    <link href="https://fonts.googleapis.com/css?family=Nunito:200,600" rel="stylesheet" type="text/css">
    <link href="{{ mix('css/app.css') }}" type="text/css" rel="stylesheet"/>
    <style>
        .bg-light {
            background-color: #eae9e9 !important;
        }
    </style>
</head>
<body>
<div id="app">
</div>
<script src="{{ mix('js/app.js') }}" type="text/javascript"></script>
</body>
</html>

 

7: Crear componentes Vue Js para la aplicación Crud

En este paso, vaya a la carpeta resources>js  y cree los siguientes archivos de componentes de vue js:

  • Vista de la aplicación
  • Todas las publicaciones.vue
  • AddPost.vue
  • EditPost.vue

Tenga en cuenta que App.vue es el archivo principal de Vue. Definiremos  la vista del enrutador  en el archivo. Entonces, todas las páginas de ruta se mostrarán en el archivo App.vue

Abra el archivo App.vue y actualice el siguiente código en su archivo:

<template>
    <div class="container">
        <div class="text-center" style="margin: 20px 0px 20px 0px;">
            <span class="text-secondary">Laravel Vue CRUD Example</span>
        </div>
 
        <nav class="navbar navbar-expand-lg navbar-light bg-light">
            <div class="collapse navbar-collapse">
                <div class="navbar-nav">
                    <router-link to="/" class="nav-item nav-link">Home</router-link>
                    <router-link to="/add" class="nav-item nav-link">Add Post</router-link>
                </div>
            </div>
        </nav>
        <br/>
        <router-view></router-view>
    </div>
</template>
 
<script>
    export default {}
</script>

A continuación, abra el archivo AllPosts.vue y actualice el siguiente código en su archivo:

<template>
    <div>
        <h3 class="text-center">All Posts</h3><br/>
 
        <table class="table table-bordered">
            <thead>
            <tr>
                <th>ID</th>
                <th>Title</th>
                <th>Description</th>
                <th>Created At</th>
                <th>Updated At</th>
                <th>Actions</th>
            </tr>
            </thead>
            <tbody>
            <tr v-for="post in posts" :key="post.id">
                <td>{{ post.id }}</td>
                <td>{{ post.title }}</td>
                <td>{{ post.description }}</td>
                <td>{{ post.created_at }}</td>
                <td>{{ post.updated_at }}</td>
                <td>
                    <div class="btn-group" role="group">
                        <router-link :to="{name: 'edit', params: { id: post.id }}" class="btn btn-primary">Edit
                        </router-link>
                        <button class="btn btn-danger" @click="deletePost(post.id)">Delete</button>
                    </div>
                </td>
            </tr>
            </tbody>
        </table>
    </div>
</template>
 
<script>
    export default {
        data() {
            return {
                posts: []
            }
        },
        created() {
            this.axios
                .get('http://localhost:8000/api/posts')
                .then(response => {
                    this.posts = response.data;
                });
        },
        methods: {
            deletePost(id) {
                this.axios
                    .delete(`http://localhost:8000/api/post/delete/${id}`)
                    .then(response => {
                        let i = this.posts.map(item => item.id).indexOf(id); // find index of your object
                        this.posts.splice(i, 1)
                    });
            }
        }
    }
</script>

A continuación, abra el archivo AddPost.vue y actualice el siguiente código en su archivo:

<template>
    <div>
        <h3 class="text-center">Add Post</h3>
        <div class="row">
            <div class="col-md-6">
                <form @submit.prevent="addPost">
                    <div class="form-group">
                        <label>Title</label>
                        <input type="text" class="form-control" v-model="post.title">
                    </div>
                    <div class="form-group">
                        <label>Description</label>
                        <input type="text" class="form-control" v-model="post.description">
                    </div>
                    <button type="submit" class="btn btn-primary">Add Post</button>
                </form>
            </div>
        </div>
    </div>
</template>
 
<script>
    export default {
        data() {
            return {
                post: {}
            }
        },
        methods: {
            addPost() {
 
                this.axios
                    .post('http://localhost:8000/api/post/add', this.post)
                    .then(response => (
                        this.$router.push({name: 'home'})
                        // console.log(response.data)
                    ))
                    .catch(error => console.log(error))
                    .finally(() => this.loading = false)
            }
        }
    }
</script>

A continuación, abra el archivo EditPost.vue y actualice el siguiente código en su archivo:

<template>
    <div>
        <h3 class="text-center">Edit Post</h3>
        <div class="row">
            <div class="col-md-6">
                <form @submit.prevent="updatePost">
                    <div class="form-group">
                        <label>Title</label>
                        <input type="text" class="form-control" v-model="post.title">
                    </div>
                    <div class="form-group">
                        <label>Description</label>
                        <input type="text" class="form-control" v-model="post.description">
                    </div>
                    <button type="submit" class="btn btn-primary">Update Post</button>
                </form>
            </div>
        </div>
    </div>
</template>
 
<script>
    export default {
        data() {
            return {
                post: {}
            }
        },
        created() {
            this.axios
                .get(`http://localhost:8000/api/post/edit/${this.$route.params.id}`)
                .then((response) => {
                    this.post = response.data;
                    // console.log(response.data);
                });
        },
        methods: {
            updatePost() {
                this.axios
                    .post(`http://localhost:8000/api/post/update/${this.$route.params.id}`, this.post)
                    .then((response) => {
                        this.$router.push({name: 'home'});
                    });
            }
        }
    }
</script>

8: Definir rutas Vue Js para la aplicación Crud

Ahora, necesita definir rutas vue. Vaya a  la carpeta resources>js  , cree un archivo llamado route.js y actualice las siguientes rutas en su archivo route.js :

import AllPosts from './components/AllPosts.vue';
import AddPost from './components/AddPost.vue';
import EditPost from './components/EditPost.vue';
 
export const routes = [
    {
        name: 'home',
        path: '/',
        component: AllPosts
    },
    {
        name: 'add',
        path: '/add',
        component: AddPost
    },
    {
        name: 'edit',
        path: '/edit/:id',
        component: EditPost
    }
];

9: Incluir dependencias de Vue Js en app.js

Ahora, debe agregar todas las rutas, vue axios y otras dependencias, etc. Así que vaya a  la carpeta resources>js y  abra app.js. Luego actualice el siguiente código en su archivo app.js :

require('./bootstrap');
import Vue from ‘vue/dist/vue’;
window.Vue = require('vue');
 
import App from './App.vue';
import VueRouter from 'vue-router';
import VueAxios from 'vue-axios';
import axios from 'axios';
import {routes} from './routes';
 
Vue.use(VueRouter);
Vue.use(VueAxios, axios);
 
const router = new VueRouter({
    mode: 'history',
    routes: routes
});
 
const app = new Vue({
    el: '#app',
    router: router,
    render: h => h(App),
});

10: Ejecutar servidor de desarrollo

Ahora ejecute el siguiente comando en la terminal para actualizar el archivo app.js:

npm run watch

En esta aplicación laravel vue spa crud, ha aprendido cómo implementar una aplicación de página web única con vue en laravel.

What is GEEK

Buddha Community

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

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

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