ES6

ECMAScript, or ES, is a standardized version of JavaScript. Because all major browsers follow this specification, the terms ECMAScript and JavaScript are interchangeable.

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Table of contents

• Explore Differences Between the var and let Keywords
• Compare Scopes of the var and let Keywords
• Declare a Read-Only Variable with the const Keyword
• Mutate an Array Declared with const
• Prevent Object Mutation
• Use Arrow Functions to Write Concise Anonymous Functions
• Write Arrow Functions with Parameters
• Set Default Parameters for Your Functions
• Use the Rest Parameter with Function Parameters
• Use the Spread Operator to Evaluate Arrays In-Place
• Use Destructuring Assignment to Extract Values from Objects
• Use Destructuring Assignment to Assign Variables from Objects
• Use Destructuring Assignment to Assign Variables from Nested Objects
• Use Destructuring Assignment to Assign Variables from Arrays
• Use Destructuring Assignment with the Rest Parameter to Reassign Array Elements
• Use Destructuring Assignment to Pass an Object as a Function's Parameters
• Create Strings using Template Literals
• Write Concise Object Literal Declarations Using Object Property Shorthand
• Write Concise Declarative Functions with ES6
• Use class Syntax to Define a Constructor Function
• Use getters and setters to Control Access to an Object
• Create a Module Script
• Use export to Share a Code Block
• Reuse JavaScript Code Using import
• Use * to Import Everything from a File
• Create an Export Fallback with export default
• Import a Default Export
• Create a JavaScript Promise
• Complete a Promise with resolve and reject
• Handle a Fulfilled Promise with then
• Handle a Rejected Promise with catch