combine

Combine two observables with a map function and an optional pre-treatment.

Note: you can use the pre-treatment to add a filter, a distinctUntilChanged, any other operator that can be used in a pipe, or even an UntilDestroy operator.

Available since v1.0.0

Import

import { combine } from '@helpers4/observable';

Signature

combine<T, U, R>(source1: Observable<T>, source2: Observable<U>, map: function, options?: combineOptions<T, U>): Observable<R>

Parameters

Parameter	Type	Description
source1	Observable<T>	first source of data
source2	Observable<U>	second source of data
map	function	way to combine data
options	combineOptions<T, U>	options for the combineLatest operator (optional)

Returns

Observable<R> — an observable that emits the result of the map function

Examples

Combine two observables with a map

Combines the latest values of two observables using a mapping function.

combine(of(1), of(2), ([a, b]) => a + b)
// emits 3

Source

View source on GitHub