How to check a given string is an anagram of another string in JavaScript ? Last Updated : 03 Jul, 2024 Summarize Comments Improve Suggest changes Share Like Article Like Report In this article, we will learn how to check a given string is an anagram of another string in JavaScript. Before that, we should learn what is an anagram.An anagram is a word or sentence, which usually contains all the original letters exactly once, in order to arrange the letters of a different term or phrase. Some of the examples are given below:evil = vilea gentleman = elegant maneleven plus two = twelve plus oneThere are many approaches through which we can compare a string as an anagram of another string:Table of ContentUsing split(), sort(), and join() MethodsUsing for loopUsing a Frequency MapApproach 1: Using split(), sort(), and join() MethodsIn this article, we will use in-built functions such as split(), sort(), and join() to check if a given string is an anagram of another string in JavaScript.Example: JavaScript function checkAnagram(a, b) { // Not of same length, can't be Anagram if (a.length !== b.length) { return false; } // Inbuilt functions to rearrange the string let str1 = a.split('').sort().join(''); let str2 = b.split('').sort().join(''); let result = (str1 === str2); return result; } // Checking the output console.log(checkAnagram('abc', 'cba')); Outputtrue Approach 2: Using for loop In this article, we will the javascript for loop to check if a given string is an anagram of another string in JavaScript.Example: JavaScript function checkAnagram(a, b) { let array = {}; if (a === b) { return true; } if (a.length !== b.length) { return false; } let minCharCode = Math.min(getMinCharCode(a), getMinCharCode(b)); for (let i = 0; i < a.length; i++) { let res = a.charCodeAt(i) - minCharCode; array[res] = (array[res] || 0) + 1; } for (let j = 0; j < b.length; j++) { let res = b.charCodeAt(j) - minCharCode; if (!array[res]) { return false; } array[res]--; } return true; } function getMinCharCode(str) { let minCharCode = Infinity; for (let i = 0; i < str.length; i++) { let charCode = str.charCodeAt(i); if (charCode < minCharCode) { minCharCode = charCode; } } return minCharCode; } console.log(checkAnagram('abc', 'cba')); Outputtrue Approach 3: Using a Frequency MapUsing a frequency map to check anagrams involves creating maps for both strings, where each character's count is recorded. By comparing these maps, if all character counts match, the strings are anagrams.Example : JavaScript const areAnagrams = (str1, str2) => { if (str1.length !== str2.length) return false; const frequencyMap = (str) => { const map = {}; for (let char of str) { map[char] = (map[char] || 0) + 1; } return map; }; const map1 = frequencyMap(str1); const map2 = frequencyMap(str2); for (let char in map1) { if (map1[char] !== map2[char]) return false; } return true; }; console.log(areAnagrams("listen", "silent")); // true console.log(areAnagrams("hello", "world")); // false Outputtrue false Check for Anagram using JavaScript Visit Course Comment More infoAdvertise with us Next Article How to check a string is entirely made up of the same substring in JavaScript ? 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