How Can I Distinguish Between Floats and Integers in Programming?

Checking the Number Type: Float or Integer

Determining whether a given value is a floating-point number (float) or an integer in programming can be a useful task. This question investigates the methods to distinguish between these number types.

Using Modulus Operation

One approach is to use the modulus operator (%) to check for a remainder when dividing by 1. If the remainder is 0, the number is an integer. Conversely, if the remainder is not equal to 0, the number is a float. This method is exemplified by the function below:

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

Consider Non-Numeric Values

However, when working with user or external input, it's crucial to ensure the argument is a valid number to avoid errors. The following function incorporates additional checks to consider non-numeric values:

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

Float vs. Non-Integer

For floats, a similar function can be defined:

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

ECMA Script 2015 Update

In 2015, a standardized solution was introduced in ECMA Script 2015. This approach entails checking the 'isFinite()' property of the number. For example:

console.log(Number.isFinite(1.23)); // true
console.log(Number.isFinite('abc')); // false

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