To count the number of elements in an array that match a condition in Scala, you can use the count method of the array. This method takes a predicate function as its argument and returns the number of elements that satisfy the condition.
Here's an example to demonstrate this:
val arr = Array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
val count = arr.count(x => x % 2 == 0)
println(s"The number of even elements in the array is: $count") // Output: The number of even elements in the array is: 5
In this example, we have an array of integers arr containing the numbers from 1 to 10. We want to count the number of even elements in the array. To do this, we use the count method on the array and provide a predicate function that checks if an element is even or not. The x % 2 == 0 condition checks if an element is even or not. Finally, we print the count using the println() function.
Similarly, you can write your own predicate function to count elements that satisfy any given condition in an array.