Marisol  Kuhic

Marisol Kuhic

1627671600

Kotlin : Arithmetic Operators Usage and Example

In this part of the tutorial we will deal with arithmetic operators in kotlin.

Kotlin Complete Course:
Kotlin Introduction : https://youtu.be/2_EXYeKVX3g
Kotlin Variables & Data Types : https://youtu.be/bevfj0pFH6Q
Kotlin If-Conditions : https://youtu.be/8r0TMiKLwGo
Kotlin When Condition (Switch) : https://youtu.be/oQ3rXxU2bK4
Kotlin For Loop : https://youtu.be/10uMCFiUDNU
Kotlin While & Do-While Loop : https://youtu.be/nXStQ8WFCT0

#subtitle #android #arithmetic #kotlin #operator

What is GEEK

Buddha Community

Kotlin : Arithmetic Operators Usage and Example
Marisol  Kuhic

Marisol Kuhic

1627671600

Kotlin : Arithmetic Operators Usage and Example

In this part of the tutorial we will deal with arithmetic operators in kotlin.

Kotlin Complete Course:
Kotlin Introduction : https://youtu.be/2_EXYeKVX3g
Kotlin Variables & Data Types : https://youtu.be/bevfj0pFH6Q
Kotlin If-Conditions : https://youtu.be/8r0TMiKLwGo
Kotlin When Condition (Switch) : https://youtu.be/oQ3rXxU2bK4
Kotlin For Loop : https://youtu.be/10uMCFiUDNU
Kotlin While & Do-While Loop : https://youtu.be/nXStQ8WFCT0

#subtitle #android #arithmetic #kotlin #operator

Leonard  Paucek

Leonard Paucek

1656280800

Jump to Local IDE Code Directly From Browser React Component

React Dev Inspector

Jump to local IDE code directly from browser React component by just a simple click

This package allows users to jump to local IDE code directly from browser React component by just a simple click, which is similar to Chrome inspector but more advanced.

View Demo View Github

Preview

press hotkey (ctrl⌃ + shift⇧ + commmand⌘ + c), then click the HTML element you wish to inspect.

screen record gif (8M size):

Jump to local IDE code directly from browser React component by just a simple click

Installation

npm i -D react-dev-inspector

Usage

Users need to add React component and apply webpack config before connecting your React project with 'react-dev-inspector'.

Note: You should NOT use this package, and React component, webpack config in production mode


 

1. Add Inspector React Component

import React from 'react'
import { Inspector, InspectParams } from 'react-dev-inspector'

const InspectorWrapper = process.env.NODE_ENV === 'development'
  ? Inspector
  : React.Fragment

export const Layout = () => {
  // ...

  return (
     {}}
      onClickElement={(params: InspectParams) => {}}
    >
     
       ...
     
    
  )
}


 

2. Set up Inspector Config

You should add:

  • an inspector babel plugin, to inject source code location info
    • react-dev-inspector/plugins/babel
  • an server api middleware, to open local IDE
    • import { launchEditorMiddleware } from 'react-dev-inspector/plugins/webpack'

to your current project development config.

Such as add babel plugin into your .babelrc or webpack babel-loader config,
add api middleware into your webpack-dev-server config or other server setup.


 

There are some example ways to set up, please pick the one fit your project best.

In common cases, if you're using webpack, you can see #raw-webpack-config,

If your project happen to use vite / nextjs / create-react-app and so on, you can also try out our integrated plugins / examples with

raw webpack config

Example:

// .babelrc.js
module.exports = {
  plugins: [
    /**
     * react-dev-inspector plugin, options docs see:
     * https://github.com/zthxxx/react-dev-inspector#inspector-babel-plugin-options
     */
    'react-dev-inspector/plugins/babel',
  ],
}
// webpack.config.ts
import type { Configuration } from 'webpack'
import { launchEditorMiddleware } from 'react-dev-inspector/plugins/webpack'

const config: Configuration = {
  /**
   * [server side] webpack dev server side middleware for launch IDE app
   */
  devServer: {
    before: (app) => {
      app.use(launchEditorMiddleware)
    },
  },
}


 

usage with Vite2

example project see: https://github.com/zthxxx/react-dev-inspector/tree/master/examples/vite2

example vite.config.ts:

import { defineConfig } from 'vite'
import { inspectorServer } from 'react-dev-inspector/plugins/vite'

export default defineConfig({
  plugins: [
    inspectorServer(),
  ],
})


 

usage with Next.js

use Next.js Custom Server + Customizing Babel Config

example project see: https://github.com/zthxxx/react-dev-inspector/tree/master/examples/nextjs

in server.js, example:

...

const {
  queryParserMiddleware,
  launchEditorMiddleware,
} = require('react-dev-inspector/plugins/webpack')

app.prepare().then(() => {
  createServer((req, res) => {
    /**
     * middlewares, from top to bottom
     */
    const middlewares = [
      /**
       * react-dev-inspector configuration two middlewares for nextjs
       */
      queryParserMiddleware,
      launchEditorMiddleware,

      /** Next.js default app handle */
        (req, res) => handle(req, res),
    ]

    const middlewarePipeline = middlewares.reduceRight(
      (next, middleware) => (
        () => { middleware(req, res, next) }
      ),
      () => {},
    )

    middlewarePipeline()

  }).listen(PORT, (err) => {
    if (err) throw err
    console.debug(`> Ready on http://localhost:${PORT}`)
  })
})

in package.json, example:

  "scripts": {
-    "dev": "next dev",
+    "dev": "node server.js",
    "build": "next build"
  }

in .babelrc.js, example:

module.exports = {
  plugins: [
    /**
     * react-dev-inspector plugin, options docs see:
     * https://github.com/zthxxx/react-dev-inspector#inspector-babel-plugin-options
     */
    'react-dev-inspector/plugins/babel',
  ],
}


 

usage with create-react-app

cra + react-app-rewired + customize-cra example config-overrides.js:

example project see: https://github.com/zthxxx/react-dev-inspector/tree/master/examples/cra

const { ReactInspectorPlugin } = require('react-dev-inspector/plugins/webpack')
const {
  addBabelPlugin,
  addWebpackPlugin,
} = require('customize-cra')

module.exports = override(
  addBabelPlugin([
    'react-dev-inspector/plugins/babel',
    // plugin options docs see:
    // https://github.com/zthxxx/react-dev-inspector#inspector-babel-plugin-options
    {
      excludes: [
        /xxxx-want-to-ignore/,
      ],
    },
  ]),
  addWebpackPlugin(
    new ReactInspectorPlugin(),
  ),
)


 

usage with Umi3

example project see: https://github.com/zthxxx/react-dev-inspector/tree/master/examples/umi3

Example .umirc.dev.ts:

// https://umijs.org/config/
import { defineConfig } from 'umi'

export default defineConfig({
  plugins: [
    'react-dev-inspector/plugins/umi/react-inspector',
  ],
  inspectorConfig: {
    // babel plugin options docs see:
    // https://github.com/zthxxx/react-dev-inspector#inspector-babel-plugin-options
    excludes: [],
  },
})


 

usage with Umi2

Example .umirc.dev.js:

import { launchEditorMiddleware } from 'react-dev-inspector/plugins/webpack'

export default {
  // ...
  extraBabelPlugins: [
    // plugin options docs see:
    // https://github.com/zthxxx/react-dev-inspector#inspector-babel-plugin-options
    'react-dev-inspector/plugins/babel',
  ],

  /**
   * And you need to set `false` to `dll` in `umi-plugin-react`,
   * becase these is a umi2 bug that `dll` cannot work with `devServer.before`
   *
   * https://github.com/umijs/umi/issues/2599
   * https://github.com/umijs/umi/issues/2161
   */
  chainWebpack(config, { webpack }) {
    const originBefore = config.toConfig().devServer

    config.devServer.before((app, server, compiler) => {
      
      app.use(launchEditorMiddleware)
      
      originBefore?.before?.(app, server, compiler)
    })

    return config  
  },
}

usage with Ice.js

Example build.json:

// https://ice.work/docs/guide/basic/build
{
  "plugins": [
    "react-dev-inspector/plugins/ice",
  ]
}


 

Examples Project Code


 

Configuration

Component Props

checkout TS definition under react-dev-inspector/es/Inspector.d.ts.

PropertyDescriptionTypeDefault
keysinspector hotkeys

supported keys see: https://github.com/jaywcjlove/hotkeys#supported-keys
string[]['control', 'shift', 'command', 'c']
disableLaunchEditordisable editor launching

(launch by default in dev Mode, but not in production mode)
booleanfalse
onHoverElementtriggered when mouse hover in inspector mode(params: InspectParams) => void-
onClickElementtriggered when mouse hover in inspector mode(params: InspectParams) => void-
// import type { InspectParams } from 'react-dev-inspector'

interface InspectParams {
  /** hover / click event target dom element */
  element: HTMLElement,
  /** nearest named react component fiber for dom element */
  fiber?: React.Fiber,
  /** source file line / column / path info for react component */
  codeInfo?: {
    lineNumber: string,
    columnNumber: string,
    /**
    * code source file relative path to dev-server cwd(current working directory)
    * need use with `react-dev-inspector/plugins/babel`
    */
    relativePath?: string,
    /**
    * code source file absolute path
    * just need use with `@babel/plugin-transform-react-jsx-source` which auto set by most framework
    */
    absolutePath?: string,
  },
  /** react component name for dom element */
  name?: string,
}


 

Inspector Babel Plugin Options

interface InspectorPluginOptions {
  /** override process.cwd() */
  cwd?: string,
  /** patterns to exclude matched files */
  excludes?: (string | RegExp)[],
}


 

Inspector Loader Props

// import type { ParserPlugin, ParserOptions } from '@babel/parser'
// import type { InspectorConfig } from 'react-dev-inspector/plugins/webpack'

interface InspectorConfig {
  /** patterns to exclude matched files */
  excludes?: (string | RegExp)[],
  /**
   * add extra plugins for babel parser
   * default is ['typescript', 'jsx', 'decorators-legacy', 'classProperties']
   */
  babelPlugins?: ParserPlugin[],
  /** extra babel parser options */
  babelOptions?: ParserOptions,
}


 

IDE / Editor config

This package uses react-dev-utils to launch your local IDE application, but, which one will be open?

In fact, it uses an environment variable named REACT_EDITOR to specify an IDE application, but if you do not set this variable, it will try to open a common IDE that you have open or installed once it is certified.

For example, if you want it always open VSCode when inspection clicked, set export REACT_EDITOR=code in your shell.


 

VSCode

install VSCode command line tools, see the official docs
install-vscode-cli

set env to shell, like .bashrc or .zshrc

export REACT_EDITOR=code


 

WebStorm

  • just set env with an absolute path to shell, like .bashrc or .zshrc (only MacOS)
export REACT_EDITOR='/Applications/WebStorm.app/Contents/MacOS/webstorm'

OR

install WebStorm command line tools
Jump to local IDE code directly from browser React component by just a simple click

then set env to shell, like .bashrc or .zshrc

export REACT_EDITOR=webstorm


 

Vim

Yes! you can also use vim if you want, just set env to shell

export REACT_EDITOR=vim


 

How It Works

Stage 1 - Compile Time

  • [babel plugin] inject source file path/line/column to JSX data attributes props

Stage 2 - Web React Runtime

[React component] Inspector Component in react, for listen hotkeys, and request api to dev-server for open IDE.

Specific, when you click a component DOM, the Inspector will try to obtain its source file info (path/line/column), then request launch-editor api (in stage 3) with absolute file path.

Stage 3 - Dev-server Side

[middleware] setup launchEditorMiddleware in webpack dev-server (or other dev-server), to open file in IDE according to the request params.

Only need in development mode,and you want to open IDE when click a component element.

Not need in prod mode, or you just want inspect dom without open IDE (set disableLaunchEditor={true} to Inspector component props)

Analysis of Theory


Author: zthxxx
Source code: https://github.com/zthxxx/react-dev-inspector
License: MIT license

#react-native #react 

Juned Ghanchi

1621508255

Kotlin App Development Company in India, Hire Kotlin Developers

We are a prime Kotlin app developer in India. We build and provide the best personalized Android apps, migration services, ongoing maintenance, and management.

We have the most efficient Kotlin developers that build ultramodern, interactive, and secure mobile apps. The technologies we use to create the most advanced Kotlin apps are AR/VR, AI/ML, IoT, etc.

Hire Kotlin app developers in India. Meet us, and we will help you meet all of your technology requirements.

#kotlin app development company india #hire kotlin developers india #kotlin app development company #hire kotlin developers #kotlin development agency #kotlin app programmers

Ray  Patel

Ray Patel

1619565060

Ternary operator in Python?

  1. Ternary Operator in Python

What is a ternary operator: The ternary operator is a conditional expression that means this is a comparison operator and results come on a true or false condition and it is the shortest way to writing an if-else statement. It is a condition in a single line replacing the multiline if-else code.

syntax : condition ? value_if_true : value_if_false

condition: A boolean expression evaluates true or false

value_if_true: a value to be assigned if the expression is evaluated to true.

value_if_false: A value to be assigned if the expression is evaluated to false.

How to use ternary operator in python here are some examples of Python ternary operator if-else.

Brief description of examples we have to take two variables a and b. The value of a is 10 and b is 20. find the minimum number using a ternary operator with one line of code. ( **min = a if a < b else b ) **. if a less than b then print a otherwise print b and second examples are the same as first and the third example is check number is even or odd.

#python #python ternary operator #ternary operator #ternary operator in if-else #ternary operator in python #ternary operator with dict #ternary operator with lambda

Marisol  Kuhic

Marisol Kuhic

1627678800

Kotlin : For loop usage and declaration example

In this part of the tutorial we will see the implementation of for-loop in Kotlin.

Kotlin Complete Course:
Kotlin Introduction : https://youtu.be/2_EXYeKVX3g
Kotlin Variables & Data Types : https://youtu.be/bevfj0pFH6Q
Kotlin If-Conditions : https://youtu.be/8r0TMiKLwGo
Kotlin When Condition (Switch) : https://youtu.be/oQ3rXxU2bK4
Kotlin For Loop : https://youtu.be/10uMCFiUDNU
Kotlin While & Do-While Loop : https://youtu.be/nXStQ8WFCT0

#loop usage #kotlin #example