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sumitkumar2019sumitkumar2019
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JS Examples
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‎ES-Features-version-wise/ES10Features.js‎

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/**
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*
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*
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➡️ Array#{flat,flatMap}
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➡️ Object.fromEntries
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➡️ String#{trimStart,trimEnd}
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➡️ Symbol#description
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➡️ try { } catch {} // optional binding
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➡️ JSON ⊂ ECMAScript
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➡️ well-formed JSON.stringify
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➡️ stable Array#sort
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➡️ revised Function#toString
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*/

‎ES-Features-version-wise/ES5Features.js‎

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/**
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* ECMAScript 5 Features
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* https://treyhunner.com/es5-talk
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*
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These were the new features released in 2009:
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*/
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/**
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* ******************************************************
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* 1. Strict Mode: The "use strict" Directive
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* ******************************************************
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*/
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/**
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* ******************************************************
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* 2. String: String.prototype.trim
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* ******************************************************
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*/
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/**
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* ********************************
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* 3. Array goodies:
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* ********************************
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Array.isArray()
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Array.forEach()
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Array.map()
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Array.filter()
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Array.reduce()
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Array.reduceRight()
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Array.every()
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Array.some()
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Array.indexOf()
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Array.lastIndexOf()
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*/
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/**
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* ********************************
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* 4. Native JSON support:
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* ********************************
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JSON.parse()
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JSON.stringify()
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*/
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/**
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* ********************************
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* 5. Object goodies
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* ********************************
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*/
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/**
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* ********************************
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* 6. Date goodies
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* ********************************
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JSON.parse()
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JSON.stringify()
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*/
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/**
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* *********************************
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* 7. Accessors (getter and Setter)
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* *********************************
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*/
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/**
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* ******************************************************
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* 8. Function: Function.prototype.bind()
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* ******************************************************
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*/

‎ES-Features-version-wise/ES6Features.js‎

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/**
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* ES6 Features:
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*
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Constants
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Constants
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Scoping
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Block-Scoped Variables
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Block-Scoped Functions
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Arrow Functions
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Expression Bodies
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Statement Bodies
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Lexical this
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Extended Parameter Handling
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Default Parameter Values
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Rest Parameter
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Spread Operator
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Template Literals
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String Interpolation
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Custom Interpolation
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Raw String Access
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Extended Literals
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Binary & Octal Literal
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Unicode String & RegExp Literal
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Enhanced Regular Expression
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Regular Expression Sticky Matching
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Enhanced Object Properties
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Property Shorthand
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Computed Property Names
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Method Properties
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Destructuring Assignment
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Array Matching
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Object Matching, Shorthand Notation
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Object Matching, Deep Matching
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Object And Array Matching, Default Values
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Parameter Context Matching
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Fail-Soft Destructuring
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Modules
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Value Export/Import
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Default & Wildcard
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Classes
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Class Definition
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Class Inheritance
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Class Inheritance, From Expressions
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Base Class Access
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Static Members
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Getter/Setter
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Symbol Type
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Symbol Type
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Global Symbols
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Iterators
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Iterator & For-Of Operator
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Generators
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Generator Function, Iterator Protocol
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Generator Function, Direct Use
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Generator Matching
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Generator Control-Flow
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Generator Methods
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Map/Set & WeakMap/WeakSet
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Set Data-Structure
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Map Data-Structure
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Weak-Link Data-Structures
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Typed Arrays
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Typed Arrays
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New Built-In Methods
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Object Property Assignment
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Array Element Finding
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String Repeating
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String Searching
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Number Type Checking
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Number Safety Checking
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Number Comparison
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Number Truncation
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Number Sign Determination
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Promises
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Promise Usage
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Promise Combination
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Meta-Programming
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Proxying
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Reflection
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Internationalization & Localization
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Collation
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Number Formatting
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Currency Formatting
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Date/Time Formatting
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*/

‎ES-Features-version-wise/ES7Features.js‎

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/**
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*ES7 Features:
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*
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Array.prototype.includes()
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Exponentiation operator
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*/

‎ES-Features-version-wise/ES8Features.js‎

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/**
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* ES8 Features:
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*
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Major new features:
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Async Functions (Brian Terlson)
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Shared memory and atomics (Lars T. Hansen)
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Minor new features:
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Object.values/Object.entries (Jordan Harband)
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String padding (Jordan Harband, Rick Waldron)
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Object.getOwnPropertyDescriptors() (Jordan Harband, Andrea Giammarchi)
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Trailing commas in function parameter lists and calls (Jeff Morrison)
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*/

‎ES-Features-version-wise/ES9Features.js‎

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/**
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* ES9 Features:
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*
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Major new features:
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Asynchronous Iteration (Domenic Denicola, Kevin Smith)
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Rest/Spread Properties (Sebastian Markbåge)
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New regular expression features:
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RegExp named capture groups (Gorkem Yakin, Daniel Ehrenberg)
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RegExp Unicode Property Escapes (Mathias Bynens)
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RegExp Lookbehind Assertions (Gorkem Yakin, Nozomu Katō, Daniel Ehrenberg)
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s (dotAll) flag for regular expressions (Mathias Bynens)
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Other new features:
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Promise.prototype.finally() (Jordan Harband)
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Template Literal Revision (Tim Disney)
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*/

‎js-basics/arrays.js‎

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const numbers = [1,2];
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//**Adding new element: End */
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numbers.push(3,4);
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numbers.push(5);
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console.log(numbers);
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//**Adding new element: Begining */
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numbers.unshift(0);
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numbers.unshift(0,1);
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console.log(numbers);
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//**Adding new element: Middle*/
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numbers.splice(2,0,'a', 'b');
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console.log(numbers);
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numbers.splice(2,1,'c', 'd');
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console.log(numbers);
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/*******************************/
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//**Finding element: Primitives */
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console.log(numbers.indexOf('a'));
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console.log(numbers.indexOf(1));
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console.log(numbers.indexOf(1,2));
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console.log(numbers.indexOf('c'));
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console.log(numbers.lastIndexOf(0));
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console.log(numbers.indexOf(5) !== -1);
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console.log(numbers.includes(1));
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console.log(numbers.includes('a'));
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//**Finding element: References */
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const courses = [{id:1, name:'a'},{id:1, name:'b'},{id:1, name:'c'}];
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console.log(courses.find(function(course){return course.name === 'a'}));
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console.log(courses.findIndex(function(course){return course.name === 'a'}));
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console.log(courses.find(course=>course.name === 'a'));
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console.log(courses.findIndex(course=>course.name === 'a'));
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//**Removing element : End*/
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console.log(numbers.pop());
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//**Removing element: Begining */
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console.log(numbers.shift());
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//**Removing element: Middle */
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console.log(numbers.splice(2,1));
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console.log(numbers);
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//**Empty an array*/
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let numbers1 = [1,2,3];
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let another = numbers1;
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let another1 = numbers1;
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let another2 = numbers1;
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numbers1 = [];
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console.log(numbers1);
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console.log(another.length=0);
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console.log(another);
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console.log(another1.splice(0, another1.length));
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while(another2.length>0)
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another2.pop();
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console.log(another2);
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//**Combining and slicing an arrays */
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const first = [1,2,3];
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const second = [4,5,6];
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const third = [{id:1}];
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const combined = first.concat(second).concat(third);
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console.log(combined);
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console.log(combined.slice(2,4));
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console.log(combined.slice(6,7));
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//**Spread operator */
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const concatnated = [...first, ...second];
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console.log(concatnated);
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console.log(concatnated.slice());
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//**Iterating an array */
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concatnated.forEach(i => console.log(i));
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concatnated.forEach((i, index) => console.log(i, index));
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for(let number of numbers)console.log(number);
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//**Joining an array */
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console.log(concatnated.join(','));
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//**Spliting as an array */
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const str = "This is a String";
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const splitArray = str.split(' ');
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console.log(splitArray);
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console.log(splitArray.join('-'));
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//**Sorting as an array */
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const numberArray = [3,1,2];
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numberArray.sort();
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console.log(numberArray);
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numberArray.reverse();
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console.log(numberArray);
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const courses1 = [{id:1, name:'Node JS'},{id:2, name:'Java'}];
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console.log(courses1.sort((x, y)=>{
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const a = x.name.toUpperCase();
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const b = y.name.toUpperCase();
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if(a < b) return -1;
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if(a > b) return 1;
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if(a == b) return 0;
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}));
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//**Testing elements of an array */
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const everyValues = [1,2,3,4,5];
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const someValues = [1,2,3,-4,5];
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const allPositives = everyValues.every(value => value>=0);
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const somePositives = someValues.some(value => value>=0);
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console.log(allPositives);
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console.log(somePositives);
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console.log(someValues.every(value => value>=0));
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console.log(everyValues.some(value => value>=0));
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//**Filtering an array */
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const filteredArray = someValues.filter(value=>value>=0);
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console.log(filteredArray);
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//**Mapping an array */
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const mappedArray = filteredArray.map(value=>'<li>' + value + '</li>');
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const html = mappedArray.join(' ');
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console.log(html);
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const mappedArray1 = someValues
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.filter(value=>value>=0)
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.map(value=>({value: value}))
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.filter(obj=>obj.value>1)
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.map(obj=>obj.value);
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console.log(mappedArray1);
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//**Reducing an array */
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const result = someValues.reduce((accumlator, currentValue)=>accumlator+currentValue,0);
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console.log(result);

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