Question

How to shift each letter in a string N places up in the alphabet with JavaScript

Answer 1

function shiftEachLetterNPlacesUp(str, N) {
    str = str.toLowerCase();

    let result = '';
    let charcode = 0;
    let size = str.length;

    for (let i = 0; i < size; i++) {
        charcode = (str[i].charCodeAt(0)) + N;
        result += String.fromCharCode(charcode);
    }
    
    return result;
}

console.log(shiftEachLetterNPlacesUp('afkq', 3));




/*
run:
 
dint
 
*/

 

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Answer 2

function shiftEachLetterNPlacesUp(str, N) {
    let result = "";
    
    for (let char of str) {
        let asciicode = char.charCodeAt(0) + N;
        if (asciicode >= 97 && asciicode <= 122 || asciicode >= 65 && asciicode <= 90) {
            result += String.fromCharCode(asciicode);
        } else {
            result += char;
        }
    }
    
    return result;
}

console.log(shiftEachLetterNPlacesUp('8a Fkq', 3));



/*
run:
 
8d Int
 
*/

 

Cleaner teeth, healthier you!
Get The Secret to a Bright and Healthy Smile