ES Conventions

ES6

• The let keyword
• The const keyword
• Arrow Functions
• The … Operator
• For/of
• Map Objects
• Set Objects
• Classes
• Promises
• Symbol
• Default Parameters
• Function Rest Parameter
• String.includes()
• String.startsWith()
• String.endsWith()
• Array.from()
• Array keys()
• Array find()
• Array findIndex()
• New Math Methods
• New Number Properties
• New Number Methods
• New Global Methods
• Object entries
• JavaScript Modules

ES7

• JavaScript Exponentiation (**)
• JavaScript Exponentiation assignment (**=)
• JavaScript Array includes()

ES8

• JavaScript String padding
• JavaScript Object entries()
• JavaScript Object values()
• JavaScript async and await
• JavaScript Object.getOwnPropertyDescriptors

ES9

• Asynchronous Iteration
• Promise Finally
• Object Rest Properties
• New RegExp Features
• JavaScript Shared Memory

ES10

• String.trimStart()
• String.trimEnd()
• Object.fromEntries
• Optional catch binding
• Array.flat()
• Array.flatMap()
• Revised Array.Sort()
• Revised JSON.stringify()
• Separator symbols allowed in string litterals
• Revised Function.toString()

ES11

• BigInt
• String matchAll()
• The Nullish Coalescing Operator (??)
• The Optional Chaining Operator (?.)
• Logical AND Assignment Operator (&&=)
• Logical OR Assignment (||=)
• Nullish Coalescing Assignment (??=)
• Promise allSettled(): Promise.allSettled([prom1,prom2,prom3]).then {}
• Dynamic Import

ES12

• Promise any() const first = await Promise.any([prom1,prom2,prom3]);
• String replaceAll()
• Numeric Separators (_)