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arrayIndex() function

Populates a Map given a key creating function and ArrayLike.

Signature:

export declare function arrayIndex<TKey, TItem>(items: ArrayLike<TItem>, getKey: (item: TItem, index: number) => TKey | null): Map<Exclude<TKey, null>, TItem>;

Parameters

Parameter	Type	Description
items	ArrayLike<TItem>
getKey	(item: TItem, index: number) => TKey | null

Returns:

Map<Exclude<TKey, null>, TItem>

Remarks

keys which are null are omitted.

See arrayIndex().

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