In Scala, an array's first element can be found using the head method. Here's an example:
val arr = Array(1, 2, 3, 4, 5)
val firstElement = arr.head
println(firstElement) // Output: 1
In this example, we have declared an array arr that contains the numbers 1 through 5. We then call the head method on the array to retrieve its first element, which is assigned to the variable firstElement. Finally, we print the value of firstElement, which is 1.
It's important to note that if the array is empty, calling the head method will result in an exception. To avoid this, you can use the headOption method, which returns an Option object that may contain the first element of the array if it is not empty. Here's an example:
val emptyArr = Array.empty[Int]
val firstElementOption = emptyArr.headOption
println(firstElementOption) // Output: None
In this example, we have declared an empty array emptyArr and called the headOption method to retrieve its first element. Since the array is empty, the method returns None, which is printed to the console.