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richardszalay edited this page May 20, 2011
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Determines if all value in the sequences matches against predicate
function all(predicate : Function) : IObservable.<Boolean>
predicate is function(value : T) : Boolean
predicate will be called for each value that comes from the source. If predicate returns false, the value false will be emitted and the sequence will immediately complete (unsubscribing from the source).
If the source sequence completes without predicate ever returning false (including an empty source sequence), the value true will be emitted and the sequence will immediately complete.
The returned sequence completes either when predicate returns false or when the source sequence completes.
The returned sequence errors when the source sequences errors or when predicate throws an error.
xs = source
ys = output
f(x) = predicate
xs ──o─────o─────o─────o
│ │ │ │
f(x) f(x) f(x) f(x)
true true true false
│
ys ────────────────────o/
false
xs ──o─────o─────o─────/
│ │ │ │
f(x) f(x) f(x) │
true true true │
│
ys ────────────────────o/
true
IObservable.<Boolean>
Observable.fromEvent(stage, KeyboardEvent.KEY_DOWN)
.take(5)
.all(function(event : KeyboardEvent) : Boolean { return event.altKey; })
.subscribe(function(all : Boolean) : void
{
if (all)
{
trace("You pressed 5 keys without letting go of alt");
}
else
{
trace("You pressed a key without pressing alt");
}
});
var source : IObservable = Observable.range(0, 10);
source.all(function(i : int) : Boolean { return i < 5; })
.subscribe(function(all : Boolean) : void
{
if (all)
{
trace("The range contained values that are all < 5");
}
else
{
trace("The range contained a value that was >= 5");
}
});
// Trace output is:
// The range contained a value that was >= 5