Open fun in kotlin

open class MindOrks {
    //use open keyword to allow child class to override it
    open fun courseName(){
        println("Course Name")
    }
}

class AndroidPro : MindOrks(){
    //use the override keyword to override the function
    override fun courseName() {
        println("Android for Professionals")
    }
}

Source: blog.mindorks.com

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