Float or Integer: How Can I Distinguish Between Number Types in Programming?

Checking Number Type: Float vs. Integer

In programming, it's often necessary to determine the type of a number, especially whether it's a floating-point (float) or an integer. Here are a few methods to accomplish this:

1. Check for Division Remainder:

This involves dividing the number by 1 and checking the remainder. An integer will have a remainder of 0, while a float will have a non-zero remainder.

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

2. Test for Number Coercion (for Known Numbers):

If you're certain that the argument is a number, this approach uses coercion to test its value:

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

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

3. ECMA Script 2015 Standard (for Known Numbers):

Number.isInteger(n) // true for integers
Number.isFloat(n) // true for floats

Example:

Consider the following numbers:

• 1.25: Float (remainder after dividing by 1 is not 0)
• 1: Integer (remainder is 0)
• 0: Integer (remainder is 0)
• 0.25: Float (remainder is not 0)

By using any of the methods described above, you can easily check the type of these numbers.

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