Replace value with item in array

Question

I'm really not sure how to explain what i'm trying to achieve, but what is the easiest way to do something like this (in javascript):

function switchItUp(i){
    ...
}

old_values = [1, 2, 3, 4];
new_values = ['a', 'b', 'c', 'd'];

switchItUp(3); // returns "c"

Elias Zamaria · Accepted Answer · 2012-08-24 22:06:24Z

1

function switchItUp(i) {
    return new_values[old_values.indexOf(i)];
}

Keep in mind that the indexOf function does not work in IE8 and earlier. If you want support in those browsers, you may want to try jQuery's inArray function or Underscore.js's indexOf function.

answered Aug 24, 2012 at 22:06

Elias Zamaria

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1 Comment

kinakuta Over a year ago

Works... depending on the browser. indexOf for arrays has limited support.

kinakuta · Accepted Answer · 2012-08-24 22:19:16Z

0

Loop through first array until value is found, use looping variable to index into second array:

function switchItUp(i) {
    var j, l = old_values.length;
    for (j = 0; j < l; j += 1) {
        if (old_values[j] === i) {
            return new_values[j];
        }
    }
}

answered Aug 24, 2012 at 22:19

kinakuta

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