sgauthier
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27 lines
628 B
JavaScript
27 lines
628 B
JavaScript
// cheap lodash replacements
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export function memoize(fn) {
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let result = null;
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const memoized = () => {
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if (result == null) {
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result = fn();
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}
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return result;
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};
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return memoized;
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}
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/**
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* drop-in replacement for _.without
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*/
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export function without(items, item) {
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return items.filter((i) => i !== item);
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}
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export function union(itemsA, itemsB) {
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const set = new Set();
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const insertItem = (item) => set.add(item);
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itemsA.forEach(insertItem);
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itemsB.forEach(insertItem);
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const result = [];
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set.forEach((key) => result.push(key));
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return result;
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}
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