Documentation for method stable
Documentation for method stable, assembled from the following types:
method stable(Supply: , : = --> Supply)
Creates a new supply that only passes on a value flowing through the given supply if it wasn't superseded by another value in the given
$time (in seconds). Optionally uses another scheduler than the default scheduler, using the
To clarify the above, if, during the timeout
$time, additional values are emitted to the
Supplier all but the last one will be thrown away. Each time an additional value is emitted to the
Supplier, during the timeout,
$time is reset.
This method can be quite useful when handling UI input, where it is not desired to perform an operation until the user has stopped typing for a while rather than on every keystroke.
my = Supplier.new;my = .Supply;.tap(-> );.emit(42);my Supply = .stable(5);.tap(-> );sleep(3);.emit(43); # will not be seen by $supply2 but will reset $time.emit(44);sleep(10);# OUTPUT: «Supply1 got: 42␤Supply1 got: 43␤Supply1 got: 44␤Supply2 got: 44␤»
As can be seen above,
$supply1 received all values emitted to the
$supply2 only received one value. The 43 was thrown away because it was followed by another 'last' value 44 which was retained and sent to
$supply2 after approximately eight seconds, this due to the fact that the timeout
$time was reset after three seconds.