Kotlin: simple onTextChanged listener in Android

EditTextUtils.kt

fun TextView.onTextChanged(block: (String) -> Unit) {
    addTextChangedListener(object : TextWatcher {
        override fun afterTextChanged(s: Editable?) {}
        override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}
        override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
            block(s.toString())
        }
    })
}