Question

Simple javascript question:

I have an array (50=50; 49=49; 143=143; 4005=4005; … )
which i want to turn into (50; 49; 143; 4005; …).

The name will always be the same as the value, in the name=value pair.
It will always be a number (but of various lengths).

I just cant get my head around it using .split

Thanks

Answer 1

Assuming that you mean you have an array like this:

var arr = ['50=50;','49=49;','143=143;','4005=4005;'];

Then, you may employ split like this:

var newArr = [], ii;
for (ii = 0; ii < arr.length; ii += 1) {
    newArr.push(parseInt(arr[ii].split('=')[0], 10));
}

This will result in newArr being equal to this:

var newArr = [50, 49, 143, 4005];

The way split works is it divides a string up into an array based on a delimiter string. In this example, we’ve used '=' as the delimiter, so we end up with arrays like this:

['50', '50;']
['49', '49;']
// etc.

Then, index into the first element and pass it to parseInt to produce a number, and push onto a new array with just number elements.

Here’s a working example.

Addendum

If you aren’t starting with an actual JavaScript array, but a string that you’d like to turn into an array, then add this step before the previous ones to get yourself the original array:

var str = '(50=50; 49=49; 143=143; 4005=4005;)';
var arr = str.replace(/\(|\)|;/g, '').split(' ');