Standard built-in objects

JavaScript has several objects included in its core, for example, there are objects like Math, Object, Array, and String.

The example below shows how to use the Math object to get a random number by using its random() method.

console.log(Math.random());

Standard objects (by category)

Value properties

Global properties returning a simple value.

• Infinity
• NaN
• undefined
• null literal

Function properties

Global functions returning the result of a specific routine.

• eval()
• uneval()
• isFinite()
• isNaN()
• parseFloat()
• parseInt()
• decodeURI()
• decodeURIComponent()
• encodeURI()
• encodeURIComponent()
• escape()
• unescape()

Fundamental objects

General language objects, functions and errors.

• Object
• Function
• Boolean
• Symbol
• Error
• EvalError
• InternalError
• RangeError
• ReferenceError
• SyntaxError
• TypeError
• URIError

Numbers and dates

Objects dealing with numbers, dates and mathematical calculations.

• Number
• Math
• Date

Text processing

Objects for manipulating texts.

• String
• RegExp

Indexed collections

Collections ordered by an index. Array-type objects.

• Array
• Int8Array
• Uint8Array
• Uint8ClampedArray
• Int16Array
• Uint16Array
• Int32Array
• Uint32Array
• Float32Array
• Float64Array

Keyed collections

Collections of objects as keys. Elements iterable in insertion order.

• Map
• Set
• WeakMap
• WeakSet

Structured data

Data buffers and JavaScript Object Notation.

• ArrayBuffer
• DataView
• JSON

Control abstraction objects

• Promise

Reflection

• Reflect
• Proxy

Internationalization

Additions to the ECMAScript core for language-sensitive functionalities.

• Intl
• Intl.Collator
• Intl.DateTimeFormat
• Intl.NumberFormat

Non-standard objects

• Generator
• Iterator
• ParallelArray
• StopIteration

Other

• arguments