Throttle the rate at which a function is called to no more than the given rate

throttle.kt

import android.os.Handler

/**
 * Throttle the rate at which a function is called
 */
fun throttle(function: () -> Unit, rate: Long): () -> Unit {
    var throttled = false
    var called = false

    fun emit() {
        if (called) {
            function()
            called = false
            throttled = true
            //Timer().schedule(timerTask { emit() }, rate) // Use this when not Android
            Handler().postDelayed({ emit() }, rate) // Use this on Android
        } else {
            throttled = false
        }
    }

    return {
        called = true
        if (!throttled) {
            emit()
        }
    }
}