JavaScript-Core-Concepts

This is my private repository. Becouse it has been 'JavaScript & React core concept'...

Most important syntex in JavaScript:

1. Variable declearation----- (let, const);
2. Condition----- (if, else);
3. Array and Object----- (number, string);
4. Loop----- (for-loop, while-loop);
5. Function-----(normal, arrow);

Most important (Array, Object) Core methods:

1. Map-----(array into object OR [{...}, {...}, {...}] ) OR Get property and return;
2. Foreach-----(array into object OR [{...}, {...}, {...}] ) OR Get property and console.log;
3. Filter-----(choose item, removed item);
4. Find-----(find out the special array OR object properties);

@ Extra JS Array Methods:

5. reduce()
6. includes()
7. push()
8. pop()
9. length()
10. indexOf()

@ NOTE:

1. Array and Object Destructuring and (Array in Three Dots);
2. JS Shortcut Ternary-----(Variable Name = Condition ? True value : False value);
3. API AND JSON-----(Api-Featch, Convert-Structure = Json to Object and Object to Json = [[ console.log(JSON.stringify(objectName)) && myData = JSON.stringify(objectName)) ]];

Fetch JSON Localstorage object keys values: (Set && get)

1. Featch '03' WEB-API and create DOM website;
2. Set Object/JSON Local-Storage (keys && values) = { VariableName = Object.keys(objectName) };
3. Get Object/JSON Local-Storage (keys && values) = { VariableName = Object.values(objectName) };
4. Array in Object Name = [{id: 01, name: 'theMealdb = https://www.themealdb.com/api.php', categories: 'Food Images'}, // {id: 02, name: 'pixabay = https://pixabay.com/api/docs/', categories: 'Images && Videos'}, // {id: 03, name = 'theMealdb: https://www.themealdb.com/api.php', categories: 'Name'}];

Node.js/new apps setup table

• Update Node
  • Windows
  • Mac
• Install and Update Yarn
  • Windows
  • Mac
• VS Code Editor Setup
  • Extensions
  • Settings
  • Set Line Breaks
• Linting Setup
  • Install Dev Dependencies
  • Setup Linting Configuration file
• Contact

Update Node

Please follow the below instructions to update node in your machine:

Windows

1. Update npm

   npm install npm@latest -g

2. Clear npm cache

   npm cache clean -f

3. Install n

   npm install -g n

4. Update node to latest version

   n latest

Mac

1. With Homebrew

   brew update
   brew upgrade node

Install and Update yarn

Please follow the below instructions to install or update yarn in your machine.

On Windows

1. Install yarn

   npm install -g yarn

2. Update yarn

   yarn set version latest

On Mac

1. Install yarn

   brew install yarn

2. Update yarn

   brew update
   brew upgrade yarn

VS Code Editor Setup

In order to follow along the tutorial series, I recommend you to use Visual Studio Code Editor and install & apply the below extensions and settings.

Extensions

Install the below extensions:

• ESLint
• Prettier
• Path Autocomplete

Settings

Go to your Visual Stuido Code settings.json file and add the below settings there:

// config related to code formatting
"editor.defaultFormatter": "esbenp.prettier-vscode",
"editor.formatOnSave": true,
"[javascript]": {
  "editor.formatOnSave": false,
  "editor.defaultFormatter": null
},
"editor.codeActionsOnSave": {
  "source.fixAll.eslint": true,
  "source.organizeImports": true
},
"eslint.alwaysShowStatus": true

Set Line Breaks

Make sure in your VS Code Editor, "LF" is selected as line feed instead of CRLF (Carriage return and line feed). To do that, just click LF/CRLF in bottom right corner of editor, click it and change it to "LF". If you dont do that, you will get errors in my setup.

Linting Setup

In order to lint and format your code automatically according to popular airbnb style guide, I recommend you to follow the instructions as described in video. References are as below.

Install Dev Dependencies

yarn add -D eslint prettier
npx install-peerdeps --dev eslint-config-airbnb-base
yarn add -D eslint-config-prettier eslint-plugin-prettier

Setup Linting Configuration file

Create a .eslintrc.json file in the project root and enter the below contents:

{
  "extends": ["prettier", "airbnb-base"],
  "parserOptions": {
    "ecmaVersion": 12
  },
  "env": {
    "commonjs": true,
    "node": true
  },
  "rules": {
    "no-console": 0,
    "indent": 0,
    "linebreak-style": 0,
    "prettier/prettier": [
      "error",
      {
        "trailingComma": "es5",
        "singleQuote": true,
        "printWidth": 100,
        "tabWidth": 4,
        "semi": true
      }
    ]
  },
  "plugins": ["prettier"]
}