Crie Visuais 3D No Vue Com Lunchbox.js

Desde sua criação em 2010, o Three.js tem sido o padrão de fato para a criação de visuais 3D na web. Ao longo dos anos, várias abstrações foram construídas sobre essa biblioteca, consolidando seus recursos e o grande ecossistema de bibliotecas JavaScript para criar aplicativos Web rápidos, impressionantes e de alto desempenho.

À medida que o Vue.js amadureceu, tornou-se uma das  principais bibliotecas de escolha para desenvolvimento de interface de usuário baseada em componentes. Vue e Three.js são projetados com objetivos semelhantes; ambas as ferramentas controlam os elementos da interface do usuário de maneiras diferentes para criar visuais interativos na web.

Neste artigo, apresentaremos o Lunchbox.js , um renderizador personalizado para Three.js. Abordaremos tudo o que você precisa saber para começar a criar visuais 3D no Vue usando o Lunchbox.js:

Pré-requisitos

Para acompanhar este artigo, você deve ter o seguinte:

• Conhecimento básico do Vue e seus conceitos
• Noções básicas de Three.js

O que é o Lunchbox.js?

O Lunchbox.js usa o modelo baseado em componentes do Vue e o estilo declarativo para lidar com as funcionalidades imperativas do Three.js sob o capô.

Essa biblioteca fornece acesso a objetos e classes primitivas do Three.js por meio de componentes, como:

• malha
• luzes
• geometrias
• grupo
• materiais

Esses componentes são os blocos de construção do Lunchbox.js. São traduções diretas das classes Three.js.

Por exemplo, ao criar uma malha padrão em um projeto baunilha Three.js, usaríamos uma classe BoxGeometry() de geometria como criar uma forma cubóide, aplicar cor a ela com uma classe de material como MeshBasicMaterial(), e depois mapeá-la para a geometria combinando os dois objetos com a Mesh()classe, assim como no código a seguir:

// create geometry with sides of length 1
const geometry = new THREE.BoxGeometry(1, 1, 1)
// create yellow basic material
const material = new THREE.MeshBasicMaterial({ color: 0xffff00 })
// combine geometry + material in mesh
const mesh = new THREE.Mesh(geometry, material)
// add that mesh to the scene (assuming you've created a scene)
scene.add(mesh)

Para criar a mesma malha em um aplicativo Lunchbox.js, usaríamos as mesmas classes, exceto como componentes e, em vez de atribuí-las a variáveis ​​e combiná-las com uma Mesh()classe, as aninharíamos dentro de um <mesh>componente, assim:

<Lunchbox>
    <mesh>
        <boxGeometry :args="[1, 1 ,1]" />
        <meshBasicMaterial :color="0xffff00" />
    </mesh>
</Lunchbox>

Você notará nos exemplos acima que cada <Lunchbox>componente corresponde à classe Three.js correspondente com um nome camelCase.

 

// three.js
new THREE.Mesh()
<!-- Lunchbox -->
<mesh/>
// three.js
new THREE.BoxGeometry()
<!-- Lunchbox -->
<boxGeometry/>

As sintaxes Lunchbox.js e Three.js são muito parecidas, mas há algumas diferenças a serem observadas. Por exemplo, cada <Lunchbox>componente recebe argumentos como props usando a argspropriedade. O argsprop pega um array de argumentos e o passa para o construtor de classe do componente.

new THREE.BoxGeometry(1, 2, 3)

O código acima seria traduzido para o seguinte no Lunchbox:

<boxGeometry :args="[1, 2, 3]" />

Outras propriedades do objeto Three.js, como a colorpropriedade da MeshBasicMaterialclasse, podem ser adicionadas como uma prop reativa em um <Lunchbox>componente. Isso é exatamente como o que vimos no exemplo anterior.

<meshBasicMaterial :color="red" />

No entanto, as propriedades que utilizam notações de ponto, como o positionvetor, seriam definidas com um traço, -, em um <Lunchbox>componente assim:

<mesh :position-x="3" />

O Lunchbox oferece suporte embutido para a maioria das classes Three.js; você pode encontrar a lista de componentes aqui .

As classes não disponíveis nos componentes incluídos podem ser adicionadas usando o app.extendmétodo do Lunchbox. Por exemplo, veja como adicionaríamos a orbitControlclasse ao Lunchbox:

import { createApp } from 'lunchboxjs'
import App from 'YourApp.vue'
//Import the class from three.js
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
// tell the app to extend Lunchbox to include OrbitControls and mount the app
createApp(App)
    .extend({ OrbitControls })
    .mount('#app')    

O extend()método é um dos recursos exclusivos do Lunchbox, classes adicionadas com o método herdam todos os recursos de um <Lunchbox>componente.

Examinamos os principais conceitos do Lunchbox.js, a seguir veremos como podemos construir com o Lunchbox. Aprenderemos mais sobre os conceitos da biblioteca à medida que avançamos no tutorial.

Primeiros passos com o Lunchbox.js

Para configurar um aplicativo Lunchbox.js, primeiro instale o Vue usando a CLI do Vite:

npm create vite@latest

Após executar o comando, escolha Vue na lista de bibliotecas e dê um nome ao projeto. Em seguida, cd na pasta do projeto e execute o seguinte comando:

npm install lunchboxjs three

Este comando instalará Lunchbox.js e Three.js como dependências do aplicativo Vue. Você pode visualizá-los dentro do package.jsonarquivo no diretório raiz.

Em seguida, limpe os códigos padrão no projeto, abra o main.jsarquivo e substitua o seguinte código:

import { createApp } from 'vue'
import App from './App.vue'
createApp(App).mount('#app')

Com este código:

import { createApp } from 'lunchboxjs'
import App from './App.vue'
createApp(App).mount('#app')

Aqui, importamos a createAppfunção de lunchboxjsem vez de de vue. Isso transformará o aplicativo Vue em um ambiente Lunchbox.

Agora podemos começar a construir e renderizar objetos 3D em nosso aplicativo.

Criando uma cena

Uma cena é um objeto que nos permite configurar os itens que serão renderizados. É como uma área de exibição onde os objetos podem ser reunidos e renderizados no navegador. Veja a seguir um exemplo de sceneconfiguração no Three.js:

const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 1000 );
const renderer = new THREE.WebGLRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );

Configurar uma cena no Lunchbox.js é mais simples e menos enigmático. A biblioteca fornece um <Lunchbox>componente que contém os códigos subjacentes para criar um renderizador e uma cena no Three.js.

Para configurá-lo, vá até o App.vuecomponente principal e coloque o <Lunchbox>componente dentro da seção do modelo, assim:

<template>
  <Lunchbox>
            <!-- ... -->
  </Lunchbox>
</template>

Cada objeto aninhado dentro da <Lunchbox>tag será renderizado para o navegador. Se você salvar seu código e iniciar o servidor de desenvolvimento, deverá ver uma tela preta semelhante à abaixo.

Esta tela preta é o renderizador do nosso aplicativo; tudo o que adicionarmos à cena será exibido aqui. Você pode alterar a cor de fundo com um backgroundprop, assim:

<Lunchbox background="indigo">
            <!-- ... -->
</Lunchbox>

Aqui estão apenas alguns dos adereços que você pode usar no <Lunchbox>componente:

• background
• cameraPosition
• camera
• zoom
• shadow

Adicionando malhas

Geometrias são classes Three.js usadas para definir a forma de uma malha. Anteriormente neste artigo, demonstramos como renderizar uma malha cubóide usando o boxGeometrycomponente. Aqui, veremos como podemos renderizar mais formas 3D para o navegador.

O Lunchbox.js vem com vários componentes de geometria embutidos gerados automaticamente, você pode ver a lista de componentes disponíveis aqui .

Vá em frente e adicione um <mesh>componente dentro das Lunchboxtags e aninhe qualquer componente de geometria de sua escolha dentro. Não se esqueça de incluir um componente de material com um coloradereço.

<Lunchbox>
  <mesh>
     <boxGeometry />
     <MeshBasicMaterial color="red"/> 
  </mesh>
</Lunchbox>

O componente material utiliza a classe Three.jsMaterial()  para definir as várias propriedades de superfície do arquivo mesh.

Um <mesh>componente aceita apenas um único componente Geometry()e Material(). Para adicionar mais formas à cena, teríamos que criar mais malhas, uma para cada Geometry(), conforme mostrado abaixo.

<Lunchbox>
      <mesh>
         <boxGeometry />
         <MeshBasicMaterial color="red"/> 
      </mesh>
      <mesh>
         <torusKnotBufferGeometry />
         <MeshBasicMaterial color="grey"/> 
      </mesh>
</Lunchbox>

Alternativamente, poderíamos criar componentes separados para cada forma e importá-los dentro do componente principal da seguinte forma:

<script>
      import {Sphere} from './Sphere.vue'
</script>
<template>
      <Lunchbox>
            <Sphere />
      </Lunchbox>
</template>

Cada Geometrycomponente aceita parâmetros exclusivos que podem ser usados ​​para ajustar e manipular sua largura, altura, suavidade e outros recursos visuais. Esses parâmetros podem ser definidos no Lunchbox usando o argsprop.

<torusKnotBufferGeometry :args="[1, 0.4, 240, 20]"/>

O <mesh>componente também aceita vários adereços. E como ele serve como um contêiner para o Geometry(), também pode ser usado para manipular a posição, rotação e muito mais.

<Lunchbox>
  <mesh position-x="4" position-x="4">
      ...
  </mesh>
</Lunchbox>

No código acima, estamos adicionando um position prop que moverá a malha da esfera 4px para a direita ao longo do eixo x.

Aqui estão alguns dos adereços de malha que você pode usar para manipular suas formas:

• position (x, y, z)
• rotation (x, y, x)
• scale (x, y)

As malhas também podem ser agrupadas usando o <group>componente. Este componente serve como um container para Geometrias, e podemos adicionar quantas <mesh>quisermos dentro de cada <group>.

<Lunchbox>
     <group>
        <mesh>
           <boxGeometry />
           <MeshBasicMaterial color="red"/> 
        </mesh>
        <mesh>
           <torusKnotGeometry />
           <MeshBasicMaterial color="grey"/> 
        </mesh>
     </group>
</Lunchbox>

Adicionando texturas

Atualmente, nossas malhas não parecem muito realistas. Os materiais aplicados fazem com que pareçam um pouco plásticos. Podemos aplicar texturas, usando o <textureLoader>componente em Lunchbox, para dar a cada malha uma aparência mais realista.

O <textureLoader>componente utiliza a  classe Three.jsTexture() que nos permite mapear texturas realistas para superfícies de malha sob o capô. Para demonstrar o processo, vamos criar um modelo 3D da Terra.

Para criar o globo, limpe a cena e crie uma nova malha com geometria esférica usando o <sphereGeometry/>componente.

<Lunchbox>
  <mesh>
     <sphereGeometry />
  </mesh> 
</Lunchbox>

Em seguida, adicione um <meshPhysicalMaterial>componente dentro da malha e aninhe <textureLoader>dentro dela, assim:

<Lunchbox>
  <mesh>
      <sphereGeometry :args="[1, 32, 32]" />
      <meshPhysicalMaterial>
            <textureLoader />
      </meshPhysicalMaterial>
  </mesh>
</Lunchbox>

O <textureLoader>componente aceita um srce um attachprop. O srcprop aceita um caminho relativo ou absoluto do material de textura, enquanto o attach prop aceita a opção de mapeamento.

Usaremos as opções mape bumpMappara este exemplo. Em outras palavras, temos que declarar um segundo <textureLoader>dentro do componente mesh.

Pegue as imagens abaixo e coloque-as dentro da /publicpasta do seu projeto:

Em seguida, adicione o caminho da primeira imagem ao srcprop do primeiro <textureLoader>componente e dê attachum valor ao prop "map".

<meshPhysicalMaterial>
      <textureLoader src="/first-image" attach="map" />
      <textureLoader ... />
</meshPhysicalMaterial>

Se você salvar o projeto agora, uma silhueta esférica aparecerá no navegador. Isso ocorre porque nossa cena não tem uma fonte de luz.

Para corrigir isso, adicione <pointLight />e <directionalLight />componentes dentro do <Lunchbox>componente.

<Lunchbox>
  <directionalLight />
  <pointLight />
  <mesh>
      ...
  </mesh>
</Lunchbox>

Agora, se você salvar o projeto e retornar ao navegador, deverá ver algo parecido com a imagem abaixo:

Para tornar a imagem mais interessante e visualmente impressionante, usaremos a segunda imagem para adicionar contornos realistas ao globo.

Faremos isso da mesma forma que lidamos com a primeira imagem. Adicione o caminho da imagem ao src prop, mas desta vez dê attachum valor ao prop "bumpMap".

Adicionando animação

O Lunchbox.js fornece uma onBeforeRenderfunção que é chamada para cada quadro antes ou depois da renderização. Com esta função, podemos animar nosso globo adicionando um valor à sua rotationpropriedade em cada quadro.

Vá para a seção de script do App.vuecomponente e importe refdo Vue e a onBeforeRenderfunção do Lunchbox.

import {ref} from 'vue'
import {onBeforeRender} from 'lunchboxjs'

Em seguida, atribua o refa uma rotationvariável e passe um objeto com a seguinte propriedade:

const rotation = ref({y: 0});

Em seguida, chame a onBeforeRenderfunção e adicione o seguinte código:

onBeforeRender(() =>{
   rotation.value.y += 0.02
})

Aqui, estamos adicionando 0,02 graus à rotação do eixo y do objeto em cada quadro. Por fim, adicione um rotation-yprop à malha do globo e passe o rotation.yvalor, assim:

<mesh rotation-y="rotation.y">
        <sphereGeometry />
        <meshPhysicalMaterial>
              <textureLoader ... />
              <textureLoader ... />
        </meshPhysicalMaterial>
  </mesh>

Agora, se você salvar o projeto, seu globo deve animar bem como no exemplo abaixo.

Você pode adicionar mais animações de rotação incluindo as propriedades xe à função ,  e à malha do globo.zrefonBeforeRender

Adicionando eventos

Podemos adicionar ouvintes de eventos aos <Lunchbox>componentes da mesma forma que faríamos qualquer outro elemento no Vue. Para demonstrar, adicionaremos um evento de clique que pausará a animação do nosso globo quando for acionado.

Vá em frente e crie um onClickevento na malha do globo assim:

<mesh rotation-y="rotation.y" @click="">
    ...
</mesh>

Em seguida, crie uma variável com refe passe um valor booleano de true. Envolva a declaração dentro da onBeforeRenderfunção com uma ifinstrução:

const active = ref(true)
onBeforeRender(() =>{
 if(active){
   rotation.value.y += 0.02
  }
})

Aqui, estamos atribuindo a activevariável como ifcondição da instrução. Quando o valor é definido como false, o código dentro da instrução não será executado e a animação será pausada.

Por fim, adicione o seguinte código ao onClickevento no <mesh>componente:

<mesh rotation-y="rotation.y" @click="active = !active">
    ...
</mesh>

Agora a animação do globo será pausada e reproduzida quando for clicada, conforme mostrado abaixo:

É isso! Construímos com sucesso visuais 3D no Vue!

Como desafio, tente adicionar um fundo preto com estrelas à cena para dar ao globo uma sensação ainda mais realista. Você pode conseguir isso facilmente adicionando uma geometria plana à cena e mapeando uma textura do céu noturno. Boa sorte!

Conclusão

Neste artigo, apresentamos os principais conceitos do Lunchbox.js e demonstramos como usar essa ferramenta para criar visuais 3D no Vue. Em nosso tutorial, criamos uma cena, construímos diferentes geometrias de malha, adicionamos texturas a malhas, malhas animadas e adicionamos ouvintes de eventos a objetos em uma cena.

Lunchbox.js ainda é um trabalho em andamento, mas está pronto para produção. Você pode enviá-lo com seus aplicativos sem preocupações. Para saber mais sobre a biblioteca, visite os documentos oficiais e confira alguns exemplos de projetos criados com o Lunchbox.js .

Fonte: https://blog.logrocket.com/build-3d-visuals-vue-lunchboxjs/

#lunchboxjs  #vuejs 

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Buddha Community

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:

• c64core: retrocompute aesthetics twitter bot
• gallery.cljs: script to download walpapers from windowsonearth.org.
• nbb-action-example: example of a Github action 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

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.
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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

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Top VueJS App Development Company in USA

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