Check if two words are anagrams

The challenge

Write isAnagram(a, b) that returns true if both texts use exactly the same letters, ignoring case and spaces.

isAnagram("listen", "silent")        // true
isAnagram("Dormitory", "dirty room")  // true

Try it

Write your answer below, then press Check my answer. Your code runs right here in your browser, and the tests tell you what works.

What the tests check

• isAnagram("listen", "silent") gives true
• isAnagram("Dormitory", "dirty room") gives true
• isAnagram("hello", "world") gives false
• isAnagram("aab", "abb") gives false

Hints

Stuck? Open one hint at a time. Try again after each one.

A solution

There’s always more than one right way. Read it, make sure you understand it, then try writing it yourself without looking.

function isAnagram(a, b) {
  const key = (s) => s.toLowerCase().replaceAll(" ", "").split("").sort().join("");
  return key(a) === key(b);
}

Learn what you need

This exercise uses what Grade 10: Array Power Tools: map, filter & reduce teaches. Read those notes first if any of it is new.