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This is RxJS v 4. Find the latest version here

Rx.Observable.prototype.filter(predicate, [thisArg])

Rx.Observable.prototype.where(predicate, [thisArg])

Filters the elements of an observable sequence based on a predicate.

Arguments

  1. predicate (Function): A function to test each source element for a condition. The callback 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 that contains elements from the input sequence that satisfy the condition.

Example

var source = Rx.Observable.range(0, 5)
  .filter(function (x, idx, obs) {
    return x % 2 === 0;
  });

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

// => Next: 0
// => Next: 2
// => Next: 4
// => Completed

Location

File:

Dist:

Prerequisites:

  • None

NPM Packages:

NuGet Packages:

Unit Tests: