package main import "fmt" // intOp is a variable whose type is function that takes // 2 integers as arguments and returns an integer var intOp func(int, int) int func intAdd(a, b int) int { return a + b } func main() { intOp = intAdd fmt.Printf("intOp(2, 3) = %d\n", intOp(2, 3)) // we can assign literal functions as well intOp = func(a, b int) int { return a * b } fmt.Printf("intOp(2, 3) = %d\n", intOp(2, 3)) }