30 lines
672 B
JavaScript
30 lines
672 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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*/ export function without(items, item) {
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return items.filter((i)=>i !== item
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);
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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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;
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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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);
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return result;
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}
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//# sourceMappingURL=js_utils.js.map
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