Get decimal portion of a number with JavaScript

Question

I have float numbers like 3.2 and 1.6.

I need to separate the number into the integer and decimal part. For example, a value of 3.2 would be split into two numbers, i.e. 3 and 0.2

Getting the integer portion is easy:

n = Math.floor(n);

But I am having trouble getting the decimal portion. I have tried this:

remainder = n % 2; //obtem a parte decimal do rating

But it does not always work correctly.

The previous code has the following output:

n = 3.1 // gives remainder = 1.1

What I am missing here?

Notice that n = Math.floor(n); is only returning your desired result (the integer portion) for non-negative numbers — tsemer
– tsemer, Commented Jun 10, 2015 at 11:06
decimalPart = number - Math.floor(number) further, you can add precision to it. parseFloat(decimalPart.toPrecision(3)) // floating point with precision till 3 digits — Abhishek Chandel
– Abhishek Chandel, Commented Jul 4, 2020 at 8:40
For getting integer portion of float use Math.trunc(), not Math.floor() — gapsf
– gapsf, Commented Oct 27, 2023 at 8:05

Mohsen Robatjazi · Accepted Answer · 2023-08-31 19:14:50Z

Reading and inspecting all the answers , I assumed it would be a good idea to share another approach to achieve "Getting Fractional Part of Number in js" :

const fractionCount = (number)=>{ let count = 0; while(number !== Math.floor(number)){ number*=10; count++; } return count; } console.log(fractionCount(2.3456790))

Grzegorz Raczek · Accepted Answer · 2023-06-12 11:15:43Z

Wow, leave it to StackOverflow to overcomplicate things.

Why not just do this:

function splitDecimals(amt: number): [number, number] { const integerPart = (amt < 0 ? '-' : '') + Math.floor(Math.abs(amt)).toString(); const amountString = amt.toString(); const decimalPart = amountString.length > integerPart.length ? amountString.slice(integerPart.length) : '0'; return [Number.parseInt(integerPart), Number.parseFloat(decimalPart)]; }

If you ignore the Number.parseX you get two nice strings, otherwise you get two nice numbers, which is the best you can do if you don't know the number of decimals.

123.4567 => [123, 0.4567] 0.111222333444555 => [0, 0.111222333444555] -123.4567 => [-123, 0.4567] 123.111222333444 => [123, 0.111222333444] 111222333444555.11 => [111222333444555, 0.11] 2230000000 => [2230000000, 0]

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