user1856596 user1856596 - 10 months ago 61
Javascript Question

JavaScript: Get the second digit from a number?

I have a number assigned to a variable, like that:

var myVar = 1234;

Now I want to get the second digit (2 in this case) from that number without converting it to a string first. Is that possible?


So you want to get the second digit from the decimal writing of a number.

The simplest and most logical solution is to convert is to a string :

var digit = (''+myVar)[1];


var digit = myVar.toString()[1];

If you don't want to do it the easy way, you can do that :

var l = Math.pow(10, Math.floor(Math.log(myVar)/Math.log(10))-1);
var b = Math.floor(myVar/l);
var digit = b-Math.floor(b/10)*10;


For people interested in performances, I made a jsperf. It turns out that for random numbers using the log as I do is by far the fastest solution.