js-utils/docs/api/js-utils.setorpush.md

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setOrPush() function

Set a map key to a new array or push to the existing value.

Signature:

export declare function setOrPush<TKey, TVal>(map: Map<TKey, ReadonlyArray<TVal>>, key: TKey, val: TVal | ReadonlyArray<TVal>): Map<TKey, ReadonlyArray<TVal>>;

Parameters

Parameter	Type	Description
map	Map<TKey, ReadonlyArray<TVal>>	The destination map and source of existing values.
key	TKey	The key to get and set.
val	TVal | ReadonlyArray<TVal>	The value to add.

Returns:

Map<TKey, ReadonlyArray<TVal>>