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38 lines
679 B
38 lines
679 B
// cheap lodash replacements
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export function memoize(fn) {
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var result = null;
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var memoized = function 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(function (i) {
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return i !== item;
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});
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}
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export function union(itemsA, itemsB) {
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var set = new Set();
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var insertItem = function insertItem(item) {
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return 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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var result = [];
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set.forEach(function (key) {
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return result.push(key);
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});
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return result;
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} |