| 1 | export default function uniq(arr: any[], cache = new Map()) {
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| 2 | const r = [];
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| 3 |
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| 4 | if (Array.isArray(arr)) {
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| 5 | for (let i = 0, len = arr.length; i < len; i ++) {
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| 6 | const item = arr[i];
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| 7 | // 加一个 cache，提升性能
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| 8 | if (!cache.has(item)) {
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| 9 | r.push(item);
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| 10 | cache.set(item, true);
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| 11 | }
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| 12 | }
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| 13 | }
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| 14 | return r;
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| 15 | }
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