![]() So, it explains how the reassignment happens.įurther, let’s look at the implementation of List‘s ‘ +‘ ( plus operation) operator: public operator fun Collection. By understanding these methods, we’ll be able to effectively manage and manipulate lists in our applications. In this tutorial, we’ll explore three common methods for creating lists in Kotlin using listOf (), mutableListOf (), and the List () constructor. ![]() Now, let’s take a closer look at this compilation error. First, as the List interface and its super types don’t have the plusAssign() function, here, myList += “Tom Cruise” is the same as myList = myList + “Tom Cruise”. Kotlin provides various ways to create lists of objects. By definition, both these collections allocate sequential memory location. However, the error message is different this time: “ Kotlin: Val cannot be reassigned.” Difference between List and Array types in Kotlin Android Mobile Development Apps/Applications Kotlin List and array are two popular collections supported by Kotlin. ![]() Next, let’s test the += operator: val myList = listOf("Tom Hanks", "Brad Pitt")Īs we’ve expected, the code doesn’t compile either. If we compile the code above, the compiler complains: “Kotlin: Unresolved reference: add.” This is expected, as the List interface doesn’t have the add() method. Course Content: This course covers the following topics: What is ArrayList ArrayList Methods. Use ArrayLists to store and manipulate data. But let’s create a test to verify if it’s true: var myList = listOf("Tom Hanks", "Brad Pitt") Add, remove, sort, and find elements in an ArrayList. Since List is read-only, we can’t add an element to it. Kotlin attempts to suggest a resolution: Try to specify it explicitly. Finally, let’s look at the List type in Kotlin. Kotlin provides numerous extension functions to deal with collections. Since E for this ArrayList is Band, it rejects that.
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