JavaScript: Replace every character in a given string with the character following it in the alphabet

Last update on May 30 2022 10:01:45 (UTC/GMT +8 hours)

JavaScript Basic: Exercise-49 with Solution

Write a JavaScript program to replace every character in a given string with the character following it in the alphabet.

Pictorial Presentation:

JavaScript: Replace every character in a given string with the character following it in the alphabet

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JavaScript program to replace every character in a given string with the character following it in the alphabet.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function string_reverse(str) 
function LetterChanges(text) {
//https://goo.gl/R8gn7u
var s = text.split('');
for (var i = 0; i < s.length; i++) {
// Caesar cipher
switch(s[i]) {
case ' ':
break;
case 'z':
s[i] = 'a';
break;
case 'Z': 
s[i] = 'A';
break;
default:
s[i] = String.fromCharCode(1 + s[i].charCodeAt(0));
}

// Upper-case vowels
switch(s[i]) {
case 'a': case 'e': case 'i': case 'o': case 'u':
s[i] = s[i].toUpperCase();
}
}
return s.join('');
}
console.log(LetterChanges("PYTHON"));
console.log(LetterChanges("W3R"));
console.log(LetterChanges("php"));

Sample Output:

QZUIPO
X4S
qIq

Flowchart:

Live Demo:

See the Pen JavaScript - Replace every character in a given string with the character following it in the alphabet - basic-ex-49 by w3resource (@w3resource) on CodePen.

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Next: Write a JavaScript program to capitalize the first letter of each word of a given string.

JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());

Ref: https://bit.ly/2BXbp04