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 = vile
- a gentleman = elegant man
- eleven plus two = twelve plus one
There are many approaches through which we can compare a string as an anagram of another string:
Approach 1: Using split(), sort(), and join() Methods
In 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 outputconsole.log(checkAnagram('abc', 'cba')); |
Output
true
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')); |
Output
true
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