1. HIGH ORDER
FUNCTIONS

2. Whats are high order functions?
• One or more of its parameters is a function, and it returns
some value.
• It returns a function, but none of its parameters is a
function.
• One or more of its parameters is a function, and it returns
a function.

3. • def isEqualToFour(a:Int) = a == 4
• val list = List(1, 2, 3, 4)
• val resultExists4 = list.exists(isEqualToFour)

4. def sumInts(a: Int, b: Int): Int =
if (a > b) 0 else a + sumInts(a + 1, b)

5. Advantages
• Higher-order functions reduce program size and
accelerate development speed, particularly for large
programs.
• Expressiveness of a visual syntax
• Zero run-time cost in most cases

6. Thanks