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JavaScript: Replace each character of a given string by the next one in the English alphabet

JavaScript Basic: Exercise-84 with Solution

Write a JavaScript program to replace each character in a given string with the next in the English alphabet.

Note: ‘a’ will be replace by ‘b’ or ‘z’ would be replaced by ‘a’.

Pictorial Presentation:

JavaScript: Replace each character of a given string by the next one in the English alphabet.

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Write a JavaScript to replace each character of a given string by the next one in the English alphabet</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function alphabet_char_Shift(str) {
  var all_chars = str.split("");
  for(var i = 0; i < all_chars.length; i++) {
    var n = all_chars[i].charCodeAt() - 'a'.charCodeAt();
    n = (n + 1) % 26; 
    all_chars[i] = String.fromCharCode(n + 'a'.charCodeAt());
  }
  return all_chars.join("");
}

console.log(alphabet_char_Shift("abcdxyz"))

Sample Output:

bcdeyza

Flowchart:

Flowchart: JavaScript - Replace each character of a given string by the next one in the English alphabet

ES6 Version:

function alphabet_char_Shift(str) {
  const all_chars = str.split("");
  for(let i = 0; i < all_chars.length; i++) {
    let n = all_chars[i].charCodeAt() - 'a'.charCodeAt();
    n = (n + 1) % 26; 
    all_chars[i] = String.fromCharCode(n + 'a'.charCodeAt());
  }
  return all_chars.join("");
}

console.log(alphabet_char_Shift("abcdxyz"))

Live Demo:

See the Pen javascript-basic-exercise-84 by w3resource (@w3resource) on CodePen.


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Parse an HTTP Cookie header string and return an object of all cookie name-value pairs

Example:

const parseCookie = str =>
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    .split(';')
    .map(v => v.split('='))
    .reduce((acc, v) => {
      acc[decodeURIComponent(v[0].trim())] = decodeURIComponent(v[1].trim());
      return acc;
    }, {});
console.log(parseCookie('foo=bar; equation=E%3Dmc%5E2')); // { foo: 'bar', equation: 'E=mc^2' }

Output:

[object Object] {
  equation: "E=mc^2",
  foo: "bar"
}

 

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