Why not just this?
const rotateArray = (arr, k) => arr.concat(arr).slice(k, k+arr.length);
Or, to avoid arr concatenation if it can be large,
arr
const rotateArray = (arr, k) => arr.slice(k).concat(arr.slice(0, k));
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Why not just this?
Or, to avoid
arrconcatenation if it can be large,