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22 lines
442 B
JavaScript
22 lines
442 B
JavaScript
"use strict";
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// FIXME: Publish as separate non-modular-matrix package
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module.exports = function createItemDeduplicator(getKey) {
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let items = new Map();
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return function deduplicateItem(item) {
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let key = getKey(item);
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if (key == null) {
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// We cannot deduplicate an item that doesn't have a key
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return item;
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} else if (items.has(key)) {
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return items.get(key);
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} else {
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items.set(key, item);
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return item;
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}
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};
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};
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