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15 lines
328 B
TypeScript
15 lines
328 B
TypeScript
// prettier-ignore
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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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// biome-ignore lint/suspicious/noAssignInExpressions: <explanation>
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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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