Decrement by 1, return previous¶
Atomically decrements by one the current value and returns the previous value of the counter. It is possible that multiple concurrent client requests may receive the same previous value. This occurs since only the decrementing part of the logic is atomic, the retrieval of the value before it is decremented is not.
Future<int> Backendless.counters.getAndDecrement(String counterName); IAtomic counter = Backendless.counters.of(String counterName); Future<int> counter.getAndDecrement();
||name of the counter to decrement.|
Function callback = (counterValue) => print("previous counter value is - $counterValue"); Backendless.counters.getAndDecrement("my counter").then(callback); IAtomic myCounter = Backendless.counters.of("my counter"); myCounter.getAndDecrement().then(callback);
||Name of the counter whose value must be decremented.|
||When this box is checked, the operation returns the previous value of the counter.|
Returns the previous value of the counter, while decrementing the value by 1.
Consider the following counter:
The example below decrements the value of the
1. This operation returns
10, since the
return previous value box is checked. To avoid confusion, the value was decremented by
1, even though the return value is
The result of this operation will look as shown below after the Codeless logic runs, as you can see the value of the counter was decremented by