equals

matches : Will check if the complete string entered is equal to the value present in the string object. equalsIgnoreCase : Ignoring the case, it checks if the string entered is equal to the value present in the string object. equals : Case sensitive and it checks if the string entered is equal to the value present in the string object. This is what I know about the methods, present in String class. Are there any other differences(Am I missing any valuable differences)? If there are no differences, then why cant matches method be removed from String class, since the functionality it puts forth

I have the following data class data class PuzzleBoard(val board: IntArray) { val dimension by lazy { Math.sqrt(board.size.toDouble()).toInt() } } I read that data classes in Kotlin get equals()/hashcode() method for free. I instantiated two objects. val board1 = PuzzleBoard(intArrayOf(1,2,3,4,5,6,7,8,0)) val board2 = PuzzleBoard(intArrayOf(1,2,3,4,5,6,7,8,0)) But still the following statements return false. board1 == board2 board1.equals(board2) In Kotlin data classes equality check, arrays, just like other classes, are compared using equals(...) , which compares the arrays references, not

This question already has an answer here: What is the best algorithm for overriding GetHashCode? 19 answers I'd like to hear from the community on how I should go about implementing GetHashCode (or override it) for my object. I understand I need to do so if I override the equals method. I have implemented it a fair amount of times, sometimes just calling the base method. I understand that my object should equal another instance of the object if it contains the same details (members). What is the best way to get a hash code from the class's members? Let's say your class looks like this: class

I've looked for overriding guidelines for structs, but all I can find is for classes. At first I thought I wouldn't have to check to see if the passed object was null, as structs are value types and can't be null. But now that I come to think of it, as equals signature is public bool Equals(object obj) it seems there is nothing preventing the user of my struct to be trying to compare it with an arbitrary reference type. My second point concerns the casting I (think I) have to make before I compare my private fields in my struct. How am I supposed to cast the object to my struct's type? C#'s as