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"

Answer 1

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!

Answer 2

Another proposal with:

• String#split()
• Array#map()
• String.fromChatCode()
• String#charCodeAt()
• Array#join()

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