Given that sequence, use reduceLeft to determine different properties about the collection. The following example shows how to get the sum of all the elements in the sequence:
scala> a.reduceLeft(_ + _) res0: Int = 64
Don’t let the underscores throw you for a loop; they just stand for the two parameters that are passed into your function. You can write that code like this, if you prefer:
a.reduceLeft((x,y) => x + y)
The following examples show how to use reduceLeft to get the product of all elements in the sequence, the smallest value in the sequence, and the largest value:
scala> a.reduceLeft(_ * _) res1: Int = 388800 scala> a.reduceLeft(_ min _) res2: Int = 2 scala> a.reduceLeft(_ max _) res3: Int = 20