In Scala, you can change all elements of an array by using the map method. The map method applies a function to each element of the array and returns a new array with the resulting values.
Here is an example of how to use map to change all elements of an array:
val array = Array(1, 2, 3)
val changedArray = array.map(_ * 2)
In this example, we create an array array with the values 1, 2, and 3. We then call the map method on array and pass it a lambda function that multiplies each element by 2. The resulting array changedArray will have the values 2, 4, and 6.
Another example of using map to change all elements of an array is to convert a string array to an integer array:
val stringArray = Array("1", "2", "3")
val intArray = stringArray.map(_.toInt)
In this example, we have a stringArray that contains string representations of integers. We use map with a lambda function that converts each string to an integer using the toInt method. The resulting intArray will have the values 1, 2, and 3 as integers.