Variables

In Kotlin, we have two types of variables: var and val. The first one, var, is a mutable reference (read-write) that can be updated after initialization. The var keyword is used to define a variable in Kotlin. It is equivalent to a normal (non-final) Java variable. If our variable needs to change at some point, we should declare it using the var keyword. Let's look at an example of a variable declaration:

    fun main(args: Array<String>) { 
        var fruit: String =  "orange" //1 
        fruit  = "banana" //2 
    } 

1. Create a fruit variable and initialize it with the vale of the orange variable.
2. Reinitialize the fruit variable with the value of the banana variable.

The second type of variable is a read-only reference. This type of variable cannot be reassigned after initialization.

The val keyword can contain...