Array.prototype.find

The `find()` method returns the value of the first item in the array based on the result of the provided testing function.

Array.prototype.findIndex

The `findIndex()` method returns the index of the first element in the array that satisfies the provided testing function.

flat & flatMap array methods

Methods to flatten any sub-arrays found in an array by concatenating their elements.

Array.prototype.includes

Determines whether or not an array includes the given value, returning a boolean value (unlike `indexOf`).

Date.prototype.toLocaleDateString

Date method to generate a language sensitive representation of a given date, formatted based on a specified locale and options.

Scroll methods on elements (scroll, scrollTo, scrollBy)

Methods to change the scroll position of an element. Similar to setting `scrollTop` & `scrollLeft` properties, but also allows options to be passed to define the scroll behavior.

ECMAScript 2015 (ES6)

Support for the ECMAScript 2015 specification. Features include Promises, Modules, Classes, Template Literals, Arrow Functions, Let and Const, Default Parameters, Generators, Destructuring Assignment, Rest & Spread, Map/Set & WeakMap/WeakSet and many more.

String.prototype.includes

The includes() method determines whether one string may be found within another string, returning true or false as appropriate.

String.prototype.padStart(), String.prototype.padEnd()

The `padStart()` and `padEnd()` methods pad the current string with a given string (eventually repeated) so that the resulting string reaches a given length. The pad is applied from the start (left) of the current string for `padStart()`, and applied from the end (right) of the current string for `padEnd()`.

Promise.prototype.finally

When the promise is settled, whether fulfilled or rejected, the specified callback function is executed.

javascript built-in: array: at

javascript built-in: array: fill

javascript built-in: array: flat

javascript built-in: array: join

javascript built-in: array: keys

javascript built-in: array: map

javascript built-in: array: pop

javascript built-in: array: push

javascript built-in: function: tostring: implements `function.prototype.tostring` revision

javascript built-in: map: clear

javascript built-in: map: delete

javascript built-in: map: get

javascript built-in: map: has

javascript built-in: map: keys

javascript built-in: map: set

javascript built-in: map: size

javascript built-in: map: values

javascript built-in: object: getprototypeof

javascript built-in: object: isprototypeof

javascript built-in: object: setprototypeof

javascript built-in: proxy: handler: getprototypeof

javascript built-in: proxy: handler: setprototypeof

javascript built-in: reflect: getprototypeof

javascript built-in: reflect: setprototypeof

javascript built-in: regexp: global: prototype accessor property (es2015)

javascript built-in: regexp: ignorecase: prototype accessor property (es2015)

javascript built-in: regexp: multiline: prototype accessor property (es2015)

javascript built-in: regexp: source: prototype accessor property (es2015)

javascript built-in: regexp: sticky: prototype accessor property (es2015)

javascript built-in: set: add

javascript built-in: set: clear

javascript built-in: set: delete

javascript built-in: set: has

javascript built-in: set: keys

javascript built-in: set: size

javascript built-in: set: union

javascript built-in: set: values

javascript built-in: string: at

javascript built-in: symbol: tostringtag: `tostringtag` available on all dom prototype objects

javascript built-in: typedarray: indexed properties not consulting prototype