8 lines
203 B
TypeScript
8 lines
203 B
TypeScript
/**
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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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export declare function groupBy<K, T>(
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list: ReadonlyArray<T>,
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keyFn: (item: T) => K,
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): Map<K, ReadonlyArray<T>>;
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