user1856596 - 1 year ago 96
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];
``````

or

``````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;
``````

Demonstration

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.

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