JavaScript 2009 (ES5)

The first major revision to JavaScript. ECMAScript 2009 is also known as ES5.

"use strict" Allows code to be executed in "strict mode" String [] access Returns the character at a specified index in a string

Aallows strings over multiple lines if escaped with \ String.trim() Removes whitespace from both sides of a string Array.isArray() Returns true if a variable is an array

Creates a new array from a function on each element

Creates an array from array elements that passes a test

Reduces an array to a single value (from left)

Reduces an array to a single value (from right)

Checks if all array values pass a test

Search for an element value and returns its position

Search for an element value and returns its position JSON.parse()

JSON.stringify()

Date.now() Returns the number of milliseconds since zero date

Converts a date object into to an ISO string

Converts a date object into to a JSON string

Allows for defining how a property value is retrieved

Allows for defining how a property value is set

Object.create()