これが役立つかどうかを確認してください:
var str = 'cold buttz';
str = str.replace(/[a-z]/gi, function(char) {
char = String.fromCharCode(char.charCodeAt(0)+1);
if (char=='{' || char=='[') char = 'a';
if (/[aeiuo]/.test(char)) char = char.toUpperCase();
return char;
});
console.log(str); //= "dpmE cvUUA"
編集:あなたのコードは、私の最後の回答からの厄介なコピー/貼り付けのようなものだったことがわかります...何が問題なのかを簡単に説明します:
function LetterChanges(str) {
var c = str.split(""); // array of letters from `str`
var vowels = ["a", "e", "i", "o", "u"]; // array of vowels
// `c` and `vowels` are two different objects
// so this test will always be false
if (c == vowels) {
// `toUpperCase` is a method on strings, not arrays
vowels.toUpperCase();
}
// You're comparing apples to oranges,
// or an array to a string, this test will also be false
// Then you return 'a'?? This was meant to be inside the `replace`
if (c == "z") return "a";
// OK, I see you recycled this from my other answer
// but you copy/pasted wrong... Here you're basically saying:
// "For each letter in the string do something and return something new"
return str.replace(/[a-z]/gi, function(s) { // `s` is the letter
// Here we find out the next letter but
// `c` is an array and `charCodeAt` expects an index (number)
return String.fromCharCode(s.charCodeAt(c)+1);
// `.charCodeAt(0)` gives you the code for the first letter in a string
// in this case there's only one.
});
}