13 lines
248 B
TypeScript
13 lines
248 B
TypeScript
export function groupBy<T, K extends keyof any>(
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arr: T[],
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key: (i: T) => K
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): Record<K, T[]> {
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return arr.reduce(
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(groups, item) => {
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;(groups[key(item)] ||= []).push(item)
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return groups
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},
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{} as Record<K, T[]>
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)
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}
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