In this article, we learn how to check whether strings are in rotation with each other or not in JavaScript.
For string, rotation check must follow these steps:-
Step 1: Define two string 1 and string 2.
Step 2: To check whether string 2 is the rotation of string 1 then, first check the length of both the strings. If they are not equal, then string 2 cannot be a rotation of string 1.
Step 3: Concatenate string 1 with itself and assign it to string 1.
Step 4: Check the index of string 2 in string 1. If it exists then, string 2 is a rotation of string 1.
Now create an Html file and add the following to it.
<!DOCTYPE html>
<html>
<body>
<div>str1 = <span id="str1"></span> </div>
<div>str2 = <span id="str2"></span></div>
<div>concat str1 with itself = <span id="concat"></span></div>
<div id="output"></div>
<script>
let str1 = "abcde";
let str2 = "deabc";
document.getElementById("str1").innerHTML = str1;
document.getElementById("str2").innerHTML = str2;
if(str1.length==str2.length){
str1 = str1 + str1;
document.getElementById("concat").innerHTML = str1;
if(str1.includes(str2)){
document.getElementById("output").innerHTML = "string 2 is a rotation of string 1";
}
else{
document.getElementById("output").innerHTML = "string 2 is not a rotation of string 1";
}
}
else{
document.getElementById("output").innerHTML = "string 2 cannot be a rotation of string 1"
}
</script>
</body>
</html>
Output:-
