JavaScript .isInteger()

The Number.isInteger() method is a part of the Number class in JavaScript.

It accepts a single argument, value, and returns true if the passed argument is an integer, and returns false otherwise.

Syntax

Number.isInteger(value);

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• value (required): The value to check.

Examples

To verify if a value is an integer or not:

const x = 13 / 5;
// x = 2.6

console.log(Number.isInteger(x));
// Output: false

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const y = 10 / 5;
// y = 2

console.log(Number.isInteger(y));
// Output: true

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The above example passes an integer and a decimal value into Number.isInteger() method, to verify if the value is an integer or not. Then, the result is printed.

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