Helper class that invokes once

Once.kt

import java.util.concurrent.atomic.AtomicBoolean

/**
 * Created with ❤ by Sergey Chilingaryan
 */

// Yes, I made class for this simple call
// but this is more readable than having booleans and checking ifs
// I hate using booleans with ifs to do things once

class Once {
    private val done = AtomicBoolean()

    fun run(task: () -> Unit?) {
        if (done.get()) return
        if (done.compareAndSet(false, true)) {
            task()
        }
    }
}

USAGE

private val once = Once()
once.run { //YOUR_CODE_HERE }