Question

I am trying to create a function that builds a string made up of the characters of two given strings.

The function has 3 arguments:

1. searchString – a String that is scanned character by character to
   identify the position of newCharacter
2. originalString – a string the same length as searchString
3. newCharacter – a 1 character string.

The function should return a new string that contains newCharacter in the same positions as in searchString otherwise the characters at the corresponding positions of the originalString.

Example:

searchString = data, 
originalString = bcde 
newCharacter = a

The function would return "bada".

Answer 1

try this:

var rossFn = function (searchString, originalString, newCharacter) {
    var initialValue = "";
    for (var i = 0; i < searchString.length; i++) {
        if (searchString.charAt(i) === newCharacter) {
            initialValue += newCharacter;
        } else {
            initialValue += originalString.charAt(i);
        }
    }
    return initialValue;
}