LazyAsync | /mod.ts | better_iterators@v1.2.1

method LazyAsync.prototype.associateBy

import { LazyAsync } from "https://deno.land/x/better_iterators@v1.2.1/mod.ts";

associateBy<Key>(uniqueKeyFn: Transform<T, Key>): Promise<Map<Key, T>>

Given uniqueKeyFn, use it to extract a key from each item, and create a 1:1 map from that to each item.

associateBy<Key, Value>(uniqueKeyFn: Transform<T, Key>, valueFn: Transform<T, Value>): Promise<Map<Key, Value>>

Takes an additional valueFn to extract a value from T. The returned map maps from Key to Value. (instead of Key to T)

Given uniqueKeyFn, use it to extract a key from each item, and create a 1:1 map from that to each item.

Type Parameters

Key

uniqueKeyFn: Transform<T, Key>

Promise<Map<Key, T>>

Takes an additional valueFn to extract a value from T. The returned map maps from Key to Value. (instead of Key to T)

Key

Value

uniqueKeyFn: Transform<T, Key>

Promise<Map<Key, Value>>