Kotlin : safe lambdas (no memory leak)?

Question

After having read this article about Memory Leaks, I am wondering whether using lambdas in Kotlin Android project is safe. It\'s true that lambda syntax makes me program wit

Answer 1

Here's a simple example of a leak, where the closure/block captures this:

class SomeClass {
    fun doWork() {
        doWorkAsync { onResult() } // leaks, this.onResult() captures `this`
    }

    fun onResult() { /* some work */ }
}

You'll need to use a WeakReference.

fun doWork() {
    val weakThis = WeakReference(this)
    doWorkAsync { weakThis?.get()?.onResult() } // no capture, no leak!
}

It'd be great if Kotlin copied the [weak self] idea from Swift.