Rx.Observable.prototype.takeWhile(predicate, [thisArg])
Returns elements from an observable sequence as long as a specified condition is true.
Arguments
predicate
(Function
): A function to test each source element for a condition. The callback is called with the following information:- the value of the element
- the index of the element
- the Observable object being subscribed
[thisArg]
(Any
): Object to use as this when executing callback.
Returns
(Observable
): An observable sequence that contains the elements from the input sequence that occur before the element at which the test no longer passes.
Example
// With a predicate
var source = Rx.Observable.range(1, 5)
.takeWhile(function (x) { return x < 3; });
var subscription = source.subscribe(
function (x) {
console.log('Next: ' + x);
},
function (err) {
console.log('Error: ' + err);
},
function () {
console.log('Completed');
});
// => Next: 0
// => Next: 1
// => Next: 2
// => Completed
Location
File:
Dist:
Prerequisites:
- None
NPM Packages:
NuGet Packages:
Unit Tests: