| 1 | function compare(a, b) {
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| 2 | const itemA = a === undefined ? 0 : a;
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| 3 | const itemB = b === undefined ? 0 : b;
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| 4 | if (Array.isArray(itemA) && Array.isArray(itemB)) {
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| 5 | if (itemA.length === 0 && itemB.length === 0)
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| 6 | return 0;
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| 7 | const diff = compare(itemA[0], itemB[0]);
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| 8 | if (diff !== 0)
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| 9 | return diff;
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| 10 | return compare(itemA.slice(1), itemB.slice(1));
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| 11 | }
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| 12 | if (itemA < itemB)
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| 13 | return -1;
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| 14 | if (itemA > itemB)
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| 15 | return 1;
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| 16 | return 0;
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| 17 | }
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| 18 | export function sortBy(arr, fn) {
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| 19 | return arr.sort((a, b) => compare(fn(a), fn(b)));
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| 20 | }
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| 21 | export function uniq(arr) {
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| 22 | return arr.filter((a, i) => arr.indexOf(a) === i);
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| 23 | }
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| 24 | export function uniqWith(arr, fn) {
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| 25 | return arr.filter((a, i) => !arr.some((b, j) => j > i && fn(a, b)));
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| 26 | }
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