JavaScript: Change the characters (lower case) in a string where a turns into z, b turns into y, c turns into x, ..., n turns into m, m turns into n, ..., z turns into a

JavaScript Basic: Exercise-134 with Solution

Reverse Alphabetical Order of Lowercase Letters

Write a JavaScript program to change the characters (lower case) in a string where a turns into z, b turns into y, c turns into x, ..., n turns into m, m turns into n, ..., z turns into a.

Visual Presentation:

Sample Solution:

JavaScript Code:

// Function to change characters in a string based on specified logic
function change_char(str1) {
    var result = []; // Initialize an empty array to store the resulting characters
    for (var i = 0; i < str1.length; i++) {
        var char_order = str1.charCodeAt(i) - 'a'.charCodeAt(0); // Get the character code and calculate its order relative to 'a'
        var change_char = 25 - char_order + 'a'.charCodeAt(0); // Calculate the new character based on the order difference
        result.push(String.fromCharCode(change_char)); // Convert the character code back to character and add it to the result array
    }
    return result.join(""); // Join the characters in the result array into a string and return
}

// Test cases
console.log(change_char("abcxyz")); // Output: "zyxcba"
console.log(change_char("python")); // Output: "kbgslm" 

Output:

zyxcba
kbgslm

Live Demo:

See the Pen javascript-basic-exercise-134 by w3resource (@w3resource) on CodePen.

Flowchart:

ES6 Version:

/**
 * Function to change characters in a string based on specified logic.
 * @param {string} str1 - The input string
 * @returns {string} - The modified string
 */
const change_char = (str1) => {
  const result = [];
  for (let i = 0; i < str1.length; i++) {
    const char_order = str1.charCodeAt(i) - 'a'.charCodeAt(0);
    const change_char = 25 - char_order + 'a'.charCodeAt(0);
    result.push(String.fromCharCode(change_char));
  }
  return result.join("");
};

console.log(change_char("abcxyz"));
console.log(change_char("python"));

For more Practice: Solve these Related Problems:

• Write a JavaScript program that transforms a string by replacing each lowercase letter with its counterpart in reverse alphabetical order.
• Write a JavaScript function that maps each lowercase character to its mirror in the alphabet using character codes.
• Write a JavaScript program that processes a string and replaces every lowercase letter with the letter found by reversing its alphabetical position.

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