JavaScript: Returns a passed string with letters in alphabetical order

JavaScript Function: Exercise-4 with Solution

Sort String Alphabetically

Write a JavaScript function that returns a string that has letters in alphabetical order.
Example string: 'webmaster'
Expected Output: 'abeemrstw'

Note: Assume punctuation and numbers symbols are not included in the passed string..

Pictorial Presentation:

Sample Solution-1:

JavaScript Code:

// Define a function named alphabet_order that takes a string parameter (str)
function alphabet_order(str) {
  // Split the string into an array of characters, sort the array, and join the characters back into a string
  return str.split('').sort().join('');
}
// Log the result of calling alphabet_order with the input string "webmaster" to the console
console.log(alphabet_order("webmaster"));

Output:

abeemrstw

Explanation:

Flowchart:

Live Demo:

See the Pen JavaScript -Returns a passed string with letters in alphabetical order-function-ex- 4 by w3resource (@w3resource) on CodePen.

Sample Solution-2:

JavaScript Code:

// Define a function named alphabet_order that takes a string parameter (str)
function alphabet_order(str) {
  // Remove non-alphabetic characters from the input string using a regular expression
  const lettersOnly = str.replace(/[^a-zA-Z]/g, '');

  // Split the string of letters into an array, sort the array, and join the characters back into a string
  const sorted = lettersOnly.split('').sort().join('');

  // Return the sorted string
  return sorted;
}

// Declare a constant variable str with the value 'web$mast@er'
const str = 'web$mast@er';

// Call the alphabet_order function with the input string 'web$mast@er' and store the result in the variable result
const result = alphabet_order(str);

// Log the result to the console
console.log(result); 

Output:

abeemrstw

Explanation:
Using a regular expression, you can remove non-letter characters before sorting letters. The above function uses the replace() method with a regular expression to remove any characters that are not letters before sorting the remaining letters. The regular expression /[^a-zA-Z]/g matches any character that is not a letter (that is, any character that is not in the range a-z or A-Z), with the g flag making the regular expression match all instances of non-letter characters.

Flowchart:

Improve this sample solution and post your code through Disqus.

Previous: Write a JavaScript function that generates all combinations of a string.
Next: Write a JavaScript function that accepts a string as a parameter and converts the first letter of each word of the string in upper case.