@escaping in Swift

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In Swift, the @escaping keyword is used to indicate that a closure (a block of code that can be passed around and executed at a later time) may be called after the function it was passed to has completed execution.

When a closure is passed as an argument to a function, it is captured by that function and can only be executed while the function is still running. This is known as a non-escaping closure. However, if the closure may be executed after the function has completed, it is called an escaping closure.

To indicate that a closure is escaping, you can add the @escaping keyword before the parameter type in the function definition. For example:

func performTask(with closure: @escaping () -> Void) {
    // Perform some task

In this example, the performTask function takes a single argument, a closure of type () -> Void, and it marked as @escaping. This means that the closure passed as an argument to this function may be executed after the function has completed.

It is important to note that when you mark a closure as @escaping, you are responsible for ensuring that the closure is executed at some point in the future, otherwise it will result in a memory leak.

You can also use @escaping in combination with other attributes, such as @autoclosure and @noescape. @autoclosure allows you to pass an expression as a closure, and @noescape indicates that the closure will not be executed after the function has completed.

In conclusion, @escaping is a powerful feature in Swift that allows you to pass closures as arguments to functions, and enables you to perform tasks asynchronously. By marking a closure as @escaping, you ensure that the closure can be executed after the function has completed, and it is important to remember that you are responsible for ensuring that the closure is executed at some point in the future.

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