InlineFunctions.kt

const val addFragment = 1
const val replaceFragment = 2
private inline fun generateFragmentTransaction(fragmentToReplaceOrAdd : Fragment, addOrReplace: Int) : FragmentTransaction {
    return when(addOrReplace) {
        addFragment -> supportFragmentManager.beginTransaction().add(R.id.container_frame, fragmentToReplaceOrAdd)
        else -> supportFragmentManager.beginTransaction().replace(R.id.container_frame, fragmentToReplaceOrAdd)
    }
}
private fun fragmentAddOrReplacer(name : String, transaction : ()-> FragmentTransaction){
    transaction().apply {
        addToBackStack(name).commit()
    }
}
private fun openFragmentA() {
    fragmentAddOrReplacer("sampleFragment") { generateFragmentTransaction(FragmentA.newInstance(), replaceFragment) }
}