`Number.isInteger()`

Determines whether the passed value is an integer.

Since ES2015 Spec ↗

Syntax

Number.isInteger(value)

Name	Type	Required	Description
`value`	`any`	Yes	The value to test.

boolean — true if the value is a number with no fractional part; otherwise false.

console.log(Number.isInteger(42), Number.isInteger(42.0));

Output

true true

console.log(Number.isInteger('42'), Number.isInteger(4.2));

Output

false false

Does not coerce its argument - non-number values always return false. Very large floats that cannot represent fractions still count as integers.