Number.parseInt()

The Number.parseInt() method parses a string argument and returns an integer of the specified radix or base.

Syntax

Number.parseInt(string,[ radix])

Parameters

string
The value to parse. If this argument is not a string, then it is converted to one using the ToString abstract operation. Leading whitespace in this argument is ignored.
radix
An integer between 2 and 36 that represents the radix (the base in mathematical numeral systems) of the string. Be careful — this does not default to 10.
The description below explains in more detail what happens when radix is not provided.
 

Return value

An integer parsed from the given string. If the radix is smaller than 11, and the first non-whitespace character cannot be converted to a number, NaN is returned.

Description

This method has the same functionality as the global parseInt() function:

Number.parseInt === parseInt; // true

and is part of ECMAScript 2015 (its purpose is modularization of globals). Please see parseInt() for more detail and examples.

Polyfill

if (Number.parseInt === undefined) {
    Number.parseInt = window.parseInt;
}

Specifications

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Number.parseInt' in that specification.		 Standard Initial definition.
ECMAScript Latest Draft (ECMA-262)
The definition of 'Number.parseInt' in that specification.		 Draft  

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
parseIntChrome Full support YesEdge Full support 12Firefox Full support 25IE No support NoOpera Full support YesSafari Full support 9WebView Android Full support YesChrome Android Full support YesFirefox Android Full support 25Opera Android Full support YesSafari iOS Full support 9Samsung Internet Android Full support Yesnodejs Full support 0.12

Legend

Full support  
Full support
No support  
No support

See also

Last modified:

, by MDN contributors
Related Topics
  1. Standard built-in objects
  2. Number
  3. Properties
    1. Number.EPSILON
    2. Number.MAX_SAFE_INTEGER
    3. Number.MAX_VALUE
    4. Number.MIN_SAFE_INTEGER
    5. Number.MIN_VALUE
    6. Number.NEGATIVE_INFINITY
    7. Number.NaN
    8. Number.POSITIVE_INFINITY
    9. Number.prototype
  4. Methods
    1. Number.isFinite()
    2. Number.isInteger()
    3. Number.isNaN()
    4. Number.isSafeInteger()
    5. Number.parseFloat()
    6. Number.parseInt()
    7. Number.prototype.toExponential()
    8. Number.prototype.toFixed()
    9. Number.prototype.toLocaleString()
    10. Number.prototype.toPrecision()
    11. Number.prototype.toSource()
    12. Number.prototype.toString()
    13. Number.prototype.valueOf()
    14. Number.toInteger()
  5. Inheritance:
  6. Function
  7. Properties
    1. Function.arguments
    2. Function.arity
    3. Function.caller
    4. Function.displayName
    5. Function.length
    6. Function.name
    7. Function.prototype
  8. Methods
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.isGenerator()
    5. Function.prototype.toSource()
    6. Function.prototype.toString()
  9. Object
  10. Properties
    1. Object.prototype.__count__
    2. Object.prototype.__noSuchMethod__
    3. Object.prototype.__parent__
    4. Object.prototype.__proto__
    5. Object.prototype.constructor
  11. Methods
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toSource()
    10. Object.prototype.toString()
    11. Object.prototype.unwatch()
    12. Object.prototype.valueOf()
    13. Object.prototype.watch()
    14. Object.setPrototypeOf()