function test3(arr, r) {
for (let i = 0; i < r; i++) {
arr.unshift(arr.pop());
}
return arr;
}
const arr = [1,2,3,4,5,6];
const R = 3;
console.log(test3(arr, R));
ZnVuY3Rpb24gdGVzdDMoYXJyLCByKSB7Cglmb3IgKGxldCBpID0gMDsgaSA8IHI7IGkrKykgewoJCWFyci51bnNoaWZ0KGFyci5wb3AoKSk7Cgl9CgkKCXJldHVybiBhcnI7Cn0KCmNvbnN0IGFyciA9IFsxLDIsMyw0LDUsNl07CmNvbnN0IFIgPSAzOwpjb25zb2xlLmxvZyh0ZXN0MyhhcnIsIFIpKTs=