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Workers

Workers

Learn to perform actions in reaction to events or state changes with the help of workers.

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Introduction to workers

The beauty of reactive programming is that we do not have to worry about every event that occurs. We just have to define a scenario and write the code to handle that scenario. Workers in GetX are functions that allow us to define actions and map them to a reactive variableA reactive variable is a type of variable that automatically updates and notifies its listeners or observers when its value changes, allowing for real-time data synchronization and dynamic user interfaces.. When that variable’s value changes, the action is performed. Simple as that! But wait, there’s more—there are five kinds of workers in the framework, and each of them has a slightly different use case. Let’s explore them one by one!

The ever method

ever is the most straightforward worker—it performs the action every time the value of the input variable changes. In the code snippet below, we define a reactive variable count of type RxInt (though any data type would do) and input it into the method. As for the action, we log an analytics event every time the value of count changes.

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// Reactive variable
final RxInt count = 0.obs;
// Logs analytics every time user changes the count
ever<int>(count, (value) => logAnalyticsEvent('Count changed to $value'));

We also need to provide the data type to the worker, which is int in this case.

Condition

We get additional control over the updates with the condition parameter. It is of dynamic type, so we can provide it a bool directly or assign a callback that returns a bool. Below, we have added the condition that the value of count should be greater than 5.

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ever<int>(
	count,
  (value) => logAnalyticsEvent('Count changed to $value'),
  condition: () => count.value > 5,
);

In this case, the ...