CODEWITHSUNDEEP
javascriptperformancebuilt-in
Alexandre Khoury
Alexandre Khoury

Reputation: 4022

Get each digit of a number

What's the best way to get the Nth digit of a number in javascript?

For example, for 31415926, the function will return 1 if N=2.

EDIT: And if possible, tu return directly a number, not a string.

EDIT 2: It is from left to right.

Upvotes: 1

Views: 3669

Answers (3)

Xion Dark
Xion Dark

Reputation: 3434

Personally, I would use:

function getNthDigit(number, n){
    return parseInt((""+number).charAt(n));
}

But if you don't want it to be in String form ever you could use:

function getNthDigit(number, n){
    var num = number,
        digits = 0;
    do{
        num /= 10;
        digits++;
    }while(num>=1);

    num = number / Math.pow(10, (digits - n));
    num -= num % 1;

    return (num % 10);
}

On second thought, just use the first option.

Upvotes: 2

opalenzuela
opalenzuela

Reputation: 3171

UPDATE: I didn't consider the fact that it was counting from the right. My bad!

Anyway, considering that the input is STILL a string, I'd use the same function, just with a little tweak.

Why don't you use the CharAt function? I think is the best option, considering the risk of multi-byte strings!!!

EDIT: I forgot the example:

  var str = "1234567";
  var n = str.charAt(str.length-2); // n is "6"

Upvotes: 0

Virus721
Virus721

Reputation: 8315

Try with that : (''+number)[nth] or (''+number)[nth-1] if one-based.

Upvotes: 3

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