Check if two strings are anagrams

Compare the sorted, lowercased characters of both strings.

JavaScript Version 1.0.0 · MIT · .md

function areAnagram({ first, second }) { const sorted = text => Array.from(text.toLowerCase()).sort().join(''); return sorted(first) === sorted(second); }

Input & expected output

{
  "first": "Listen",
  "second": "Silent"
}

true

The edge case

{
  "first": "dormitory",
  "second": "dirty room"
}

false

Know the limits

• Spaces and punctuation count, as the edge case shows; strip them first for phrase anagrams.
• Sorting is by code point, so accented letters are distinct from their base letters.

The function above is the implementation used by the lab. The lab validates JSON types and caps size before execution; include equivalent validation when accepting untrusted input in your application.

Keep exploring

• Capitalize a string — Uppercase the first Unicode code point and preserve the remaining text.
• Reverse a string — Reverse Unicode code points without splitting surrogate pairs.
• Check a palindrome — Compare a string with its code-point reversal.