JavaScript string manipulation

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:

searchString - a String that is scanned character by character to identify the position of newCharacter
originalString - a string the same length as searchString
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".

Can you provide sample input and output of what you're trying to accomplish? — Joseph Silber
– Joseph Silber, Commented Sep 18, 2011 at 7:45
Your description is very confusing. For start, what is targetString? Another argument? — user447356
– user447356, Commented Sep 18, 2011 at 7:47
Could you provide a sample with inputs an an expected result? — Caspar Kleijne
– Caspar Kleijne, Commented Sep 18, 2011 at 7:49
Okay - updated the question with some examples and tried to clarify in more depth what I'm struggling with. Thanks very much. — Ross Cheeseright
– Ross Cheeseright, Commented Sep 18, 2011 at 7:59

evan · Accepted Answer · 2011-09-18 08:02:26Z

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;
}

edited Sep 18, 2011 at 8:02

answered Sep 18, 2011 at 7:56

evan

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2 Comments

Ross Cheeseright Over a year ago

Thanks a lot for this. I'm sorry that it doesn't make much sense. I have elaborated a little on the initial question. You guys clearly have superior brains :)

Ross Cheeseright Over a year ago

Ah, thanks a lot! You're a genius. it works perfectly. Haha. I'm amazed that you were able to figure that out from my gibberish.

100PercentVirus · Accepted Answer · 2020-01-26 03:12:22Z

Another way to solve this:

function manipulateString(searchString, originalString, newCharacter)
{
    //convert strings to array
    searchString = searchString.split(''); 
    originalString = originalString.split(''); 
    //find indices in the search string where new character occurs
    var matchingIndicesInSearchString = searchString.reduce(function(a, e, i) {
        if (e === newCharacter)
            a.push(i);
        return a;
    }, []);  

    matchingIndicesInSearchString.forEach(function (value, index, array) 
    {  //replace characters in the original string with the new character at the right indices
       originalString.splice(value,1, newCharacter);
    });
    //convert array back to string 
    return originalString.toString().replace(/,/g,'');  
}

It works. Please use like so:

var searchString   = 'data', 
    originalString = 'bcde', 
    newCharacter   = 'a';

manipulateString(searchString, originalString, newCharacter); //outputs 'bada'

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