Replace string with values from two arrays

Question

I have a string for example:

var string = \'This is a text that needs to change\';

And then I have two arrays.

var array1 =         


        

Answer 1

For the purpose of exploring other interesting methods of doing the same thing, here is an implementation using array map.

It's just another cool way of doing it, without using a loop, replace or regexp.

var string = 'This is a text that needs to change';
var array1 = ['a', 'e', 'i', 'o', 'u'];
var array2 = ['1', '2', '3', '4', '5'];

var a = string.split('');
a.map(function(c) {
    if (array1.indexOf(c) != -1) {
        a[ a.indexOf(c) ] = array2[ array1.indexOf(c) ];
    }
});

var newString = a.join('');
alert( newString );
//Outputs "Th3s 3s 1 t2xt th1t n22ds t4 ch1ng2"

Demo: JSFiddle

Interesting blog post about the array methods - map and reduce.

I'd love to hear thoughts about performance of array map vs the other methods.