javascript string character manipulation

Question

My challenge is to create a function that takes in a string and returns a new string with each character advanced 1 space of the alphabet. Ex: "hello" returns "ifmmp."

I haven't yet wrapped my code in a function. This will get me the first new character but I can't figure out how to move through the rest of the new characters.

var str = "hello";

var numStr = [];

for (var i = 0; i < str.length; i++) {

    numStr.push((str.charCodeAt(i) + 1));

}

var newStr = String.fromCharCode(numStr[0]);

//returns "i"

You may use + operator to add strings so 'a' + 'b' gives you 'ab'. Use a for loop to build newStr like var newStr = ''; for (var i = 0; ....) { newStr += String.fromCharCode(numStr[i]); }. newStr += x is like newStr = newStr + x — csharpfolk
– csharpfolk, Commented Mar 8, 2016 at 19:01

ak_ · Accepted Answer · 2016-03-08 19:06:20Z

2

You'll probably want to use fromCharCode(). Creating a function could look something like this:

JavaScript

var str = "hello";

function incrementStringLetters(s) {
    var newStr = "";
    for (var i = 0; i < s.length; i++) {
        newStr += String.fromCharCode(s.charCodeAt(i)+1);
    }
    return newStr;
}


console.log(incrementStringLetters(str))

Output

ifmmp

See it working here: https://jsfiddle.net/igor_9000/f0vy3h9v/

Hope that helps!

answered Mar 8, 2016 at 19:06

ak_

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1 Comment

adam.shaleen Over a year ago

Fantastic, thank you! I couldn't figure out how to use the fromCharCode function like this.

Nina Scholz · Accepted Answer · 2016-03-08 19:10:13Z

0

Another proposal with:

var str = "hello",
    newStr = str.split('').map(function (a) {
        return String.fromCharCode(a.charCodeAt(0) + 1);
    }).join('');

document.write(newStr);

answered Mar 8, 2016 at 19:10

Nina Scholz

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