| 1 | ;
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| 2 | function mod(x, y) {
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| 3 | return x - y * Math.floor(x / y);
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| 4 | }
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| 5 | function concat$(x, ...ys) {
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| 6 | for (var y of ys)
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| 7 | x.push(...y);
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| 8 | return x;
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| 9 | }
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| 10 | function rotate(x, n = 0) {
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| 11 | var n = mod(n, x.length);
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| 12 | return concat$(x.slice(n), x.slice(0, n));
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| 13 | }
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| 14 | module.exports = rotate;
|