Question

185

JS: how to shift each letter in the given string N places down in the alphabet?

rated 0 times [ 186] [ 1] / answers: 1 / hits: 32165 / 9 Years ago, mon, october 12, 2015, 12:00:00

how to shift each letter in the given string N places down in the alphabet? Punctuation, spaces, and capitalization should remain intact. For example if the string is ac and num is 2 the output should be ce. What's wrong with my code? It converts letter to ASCII and adds given number then converts from ASCII to letter back. The last line replaces space.

function CaesarCipher(str, num) {



    str = str.toLowerCase();

    var result = '';

    var charcode = 0;



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

        charcode = (str[i].charCodeAt()) + num;

        result += (charcode).fromCharCode();

    }

    return result.replace(charcode.fromCharCode(), ' ');



}

I'm getting

TypeError: charcode.fromCharCode is not a function

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angelicajayleneh

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answered 9 Years ago rianna · Accepted Answer

You need to pass an argument to the fromCharCode method using the String object. Try:

function CaesarCipher(str, num) {

    // you can comment this line

    str = str.toLowerCase();



    var result = '';

    var charcode = 0;



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

        charcode = (str[i].charCodeAt()) + num;

        result += String.fromCharCode(charcode);

    }

    return result;



}

console.log(CaesarCipher('test', 2));

I had to modify the return statement, because it was introducing a bug for me