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3bbc213 Dec 6, 2016
@mattpodwysocki @L8D @mmv @edge @davidwdan
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Rx.Observable.prototype.select(selector, [thisArg])

Rx.Observable.prototype.map(selector, [thisArg])

Projects each element of an observable sequence into a new form by incorporating the element's index. There is an alias for this method called map.

Arguments

  1. selector (Function | 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
  2. [thisArg] (Any): Object to use as this when executing the predicate.

Returns

(Observable): An observable sequence which results from the comonadic bind operation.

Example

// Using a value
var md = Rx.Observable.fromEvent(document, 'mousedown').map(true);
var mu = Rx.Observable.fromEvent(document, 'mouseup').map(false);

// Using a function
var source = Rx.Observable.range(1, 3)
    .select(function (x, idx, obs) {
        return x * x;
    });

var subscription = source.subscribe(
    function (x) {
        console.log('Next: ' + x);
    },
    function (err) {
        console.log('Error: ' + err);
    },
    function () {
        console.log('Completed');
    });

// => Next: 1
// => Next: 4
// => Next: 9
// => Completed

Location

File:

Dist:

NPM Packages:

NuGet Packages:

Unit Tests: