How Can I Distinguish Between Floats and Integers in JavaScript?

Determining the Nature of a Number

In programming, it's often necessary to distinguish between float and integer numbers. A float represents a number with a decimal point, while an integer is a whole number without decimals.

Checking the Number Type

To check whether a given number is a float or an integer, one method is to examine the remainder when dividing it by 1. For a float, the remainder will not be zero, while for an integer, it will be zero. This can be implemented in JavaScript as follows:

function isInt(n) {
  return n % 1 === 0;
}

However, if you are unsure whether the argument is a number, additional checks are required:

function isInt(n){
  return Number(n) === n && n % 1 === 0;
}

function isFloat(n){
  return Number(n) === n && n % 1 !== 0;
}

ECMA Script 2015 Standard

In 2019, a standardized solution for checking number types was introduced in ECMA Script 2015:

Number.isInteger(n); // true if n is an integer

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