Rotate String

Description

We are given two strings, A and B.

A shift on A consists of taking string A and moving the leftmost character to the rightmost position. For example, if A = 'abcde', then it will be 'bcdea' after one shift on A. Return True if and only if A can become B after some number of shifts on A.

Example 1:
Input: A = 'abcde', B = 'cdeab'
Output: true
Example 2:
Input: A = 'abcde', B = 'abced'
Output: false

Note:

• A and B will have length at most 100.

Solution(javascript)

/**
 * @param {string} A
 * @param {string} B
 * @return {boolean}
 */
var rotateString = function(A, B) {
    if(!A && !B) {
        return true
    }
    let current = ""
    for(let i = 0; i < A.length; i++) {
        current += A[i]
        if(A.slice(i+1) + current === B) {
            return true
        }
    }
    return false
};