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26 lines
477 B
26 lines
477 B
'use strict'; |
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Object.defineProperty(exports, '__esModule', { |
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value: true, |
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}); |
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exports.groupBy = groupBy; |
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/** |
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* Groups array items into a Map, given a function to produce grouping key. |
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*/ |
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function groupBy(list, keyFn) { |
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const result = new Map(); |
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for (const item of list) { |
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const key = keyFn(item); |
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const group = result.get(key); |
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if (group === undefined) { |
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result.set(key, [item]); |
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} else { |
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group.push(item); |
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} |
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} |
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return result; |
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}
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