23 lines
393 B
JavaScript
23 lines
393 B
JavaScript
function reverse(a, from, to) {
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--from;
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while (++from < --to) {
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var tmp = a[from];
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a[from] = a[to];
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a[to] = tmp;
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}
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}
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function rotate(a, from, to, k) {
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var n = to - from;
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k = (k % n + n) % n;
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if (k > 0) {
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reverse(a, from, from + k);
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reverse(a, from + k, to);
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reverse(a, from, to);
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}
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}
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export default {
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rotate
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};
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