Number.isInteger()

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.

Return value

The boolean value true if the given value is an integer. Otherwise false.

If the target value is an integer, return true, otherwise return false. If the value is NaN or Infinity, return false. The method will also return true for floating point numbers that can be represented as integer.

Examples

Using isInteger

Number.isInteger(0);         // true
Number.isInteger(1);         // true
Number.isInteger(-100000);   // true
Number.isInteger(99999999999999999999999); // true

Number.isInteger(0.1);       // false
Number.isInteger(Math.PI);   // false

Number.isInteger(NaN);       // false
Number.isInteger(Infinity);  // false
Number.isInteger(-Infinity); // false
Number.isInteger('10');      // false
Number.isInteger(true);      // false
Number.isInteger(false);     // false
Number.isInteger([1]);       // false

Number.isInteger(5.0);       // true
Number.isInteger(5.000000000000001); // false
Number.isInteger(5.0000000000000001); // true

Specifications

Specification
ECMAScript Language Specification # sec-number.isinteger

Browser compatibility

BCD tables only load in the browser