Codility #2-CyclicRotation

function solution(A, K) {

let arr = Array.from(A); // clone

let n = K % A.length; // for better performance

for (let i = 0; i < n; i++) {

let val = arr.pop();

arr.unshift(val);

}

return arr;

}

function solution(A, K) {

let arr = [];

for (let i = 0, j; i < A.length; i++) {

j = (i + K) % A.length;

arr[j] = A[i];

}

return arr;

}