Lazy | /lib/lazy.ts | lazy@v1.7.3

method Lazy.prototype.groupBy

import { Lazy } from "https://deno.land/x/lazy@v1.7.3/lib/lazy.ts";

groupBy<TKey>(keyFn: MapFn<TElement, TKey>): Lazy<IGrouping<TKey, TElement>>

Groups the elements by key.

groupBy<TKey, TItem>(keyFn: MapFn<TElement, TKey>, elementSelector: MapFn<TElement, TItem>): Lazy<IGrouping<TKey, TItem>>

Groups the elements by key and projects each element using the given function.

groupBy<TKey, TItem, TResult>(

keyFn: MapFn<TElement, TKey>,

elementSelector: MapFn<TElement, TItem>,

resultSelector: CombineFn<TKey, Iterable<TItem>, TResult>,

Groups the elements by key and projects each element using the given function. The elements of each group are projected using the given function.

Groups the elements by key.

Type Parameters

TKey

keyFn: MapFn<TElement, TKey>

The function to extract the key from each element.

Groups the elements by key and projects each element using the given function.

TKey

TItem

keyFn: MapFn<TElement, TKey>

The function to extract the key from each element.

elementSelector: MapFn<TElement, TItem>

The transformation function to use for each element.

Groups the elements by key and projects each element using the given function. The elements of each group are projected using the given function.

TKey

TItem

TResult

keyFn: MapFn<TElement, TKey>

The function to extract the key from each element.

elementSelector: MapFn<TElement, TItem>

The transformation function to use for each element.

resultSelector: CombineFn<TKey, Iterable<TItem>, TResult>

The transformation function to create the result elements with.