rxjs Operator: map / select
Syntax
- Rx.Observable.prototype.map(selector, [thisArg])
- Rx.Observable.prototype.select(selector, [thisArg])
Parameters
| Parameter, Type | Details |
|---|---|
selector, Function or Object | Transform function to apply to each source element or an element to yield. If selector is a function, it is called with the following information: 1. the value of the element, 2. the index of the element, 3. the Observable object being subscribed. |
[thisArg], Any | Object to use as this when executing the predicate. |
Remarks
map and select are aliases.
They produce an observable sequence emitting one element every time the source observable emits an element.
If selector is not a function, its value is emitted for each source element.
If selector is a function, the emitted element is the result of running selector on the source element, and can possibly use its position.
