JS: ECMAScript 2018

Assignment pattern for object rest properties

// assignment pattern for object with rest keys
let { cat, ...rrr } = { dog: 17, cat: 6, bird: 4 };
console.log(cat);
// 6

console.log(rrr);
// { dog: 17, bird: 4 }

• JS: Assignment pattern (destructuring)
• JS: Function parameters binding pattern

Spread operator for object literal

const xx = { ...{ dog: 1, cat: 2 }, bird: 3 };
console.log(xx);
// { dog: 1, cat: 2, bird: 3 }

• JS: Spread Operator (triple dots)

Regex features

• RegExp.prototype.dotAll, s, make the dot . also match newline characters.
• JS: Regular Expression Flags

• Named capture group.
• Lookbehind assertions.
• JS: Regular Expression Syntax

• Match characters by Unicode character property: \p{PropertyValue} and \P{PropertyValue}.
• JS: Regex Unicode Property

Async iteration

support for asynchronous iteration via the AsyncIterator protocol and async generators.

Promise finally

• Promise.prototype.finally

• JS: Promise Tutorial