I have however been able to achieve the same with the following code. I had never heard of windowed but looked it up. I am pretty new to Kotlin /Anko and realize that your answer involves RXKotlin. but then just be sure to also collect the last entry of the list -) You may also build something with fold in place. If you wouldn't need a list of lists in the first place, it could just be as easy as: myarrayList.joinToString("") This means that the size of an ArrayList type can also increase or decrease dynamically. An ArrayList type is a dynamic implementation of the array data type that allows you to add and remove element(s) from the array. or you need to take care that you do not lose the last entry as there is no final "", etc.). The ArrayList class in Kotlin can be used to create a variable of ArrayList type. you need to add some index in front or the end. and there are so many ways to solve it actually, but all have one or the other "flaw" (e.g. Val p2 = arrayOf(arrayOf(Person("John", 20), Person("Mary", 15)))Īssertions.assertTrue(p1 contentDeepEquals p2) 6.I couldn't imagine that there isn't a simpler way to do this. Moreover, we can also validate the structural equality for nested arrays holding objects of Person type using the contentDeepEquals function: data class Person (var name: String?, var age: Int?) We can solve this problem by defining the Person class as a data class: data class Person (var name: String?, var age: Int?)Īssertions.assertTrue(first contentEquals second)Īs a data class inherently defines the equals() method for value comparison, we can assert that the first and second arrays containing objects of Person type are structurally equal. That’s because we haven’t defined the equals() method in the Person class, and as a result, the contentEquals function is, by default, doing a referential equality check. Val second = arrayOf(Person("John", 20), Person("Mary", 15))įor such scenarios, the contentEquals function won’t be able to make a structural comparison of the arrays: Assertions.assertFalse(first contentEquals second) Val first = arrayOf(Person("John", 20), Person("Mary", 15)) Let’s define a Person class and initialize two arrays that contain instances of the Person class: class Person (var name: String?, var age: Int?) Now, let’s go ahead and expand our understanding to compare arrays that contain user-defined objects. So far, we’ve seen array comparisons for String values.
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