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How to use String Rotation and Concatenation In Javascript

2. Using String.prototype.repeat() and String.prototype.startsWith()

This approach checks if the string can be found within a doubled version of itself (excluding the first and last characters). If the string is made up of the same substrings, it will appear within this modified doubled version.

Example:

JavaScript 
function isMadeOfSameSubstrings(str) {
    const doubledStr = str + str;
    // Remove the first and last characters of the doubled string
    const modifiedDoubledStr = doubledStr.substring(1, doubledStr.length - 1);
    // Check if the original string appears in the modified doubled string
    return modifiedDoubledStr.includes(str);
}

console.log(isMadeOfSameSubstrings("abcabcabc")); // Output: true
console.log(isMadeOfSameSubstrings("abcdefg"));   // Output: false

Output
true
false





How to check a string is entirely made up of the same substring in JavaScript ?

In this article, we are given a string and the task is to determine whether the string is made up of the same substrings or not.

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2. Using String.prototype.repeat() and String.prototype.startsWith()