mozilla

Number.isInteger()

This is a new technology, part of the ECMAScript 2015 (ES6) standard .
This technology's specification has been finalized, but check the compatibility table for usage and implementation status in various browsers.

The Number.isInteger() method determines whether the passed value is an integer.

Syntax

Number.isInteger(value)

Parameters

value
The value to be tested for being an integer.

Description

If the target value is an integer, return true, otherwise return false. If the value is NaN or infinite, return false.

Examples

Number.isInteger(0.1);     // false
Number.isInteger(1);       // true
Number.isInteger(Math.PI); // false
Number.isInteger(-100000); // true
Number.isInteger(NaN);     // false
Number.isInteger(0);       // true
Number.isInteger("10");    // false

Polyfill

Number.isInteger = Number.isInteger || function(value) {
    return typeof value === "number" && 
           isFinite(value) && 
           Math.floor(value) === value;
};

Specifications

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

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) 16 (16) Not supported (Yes) Not supported
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support Not supported Not supported 16.0 (16) Not supported Not supported Not supported

See also

  • The Number object it belongs to.

Document Tags and Contributors

Last updated by: SphinxKnight,