Function values

Functions are values too. They can be passed around just like other values.

Function values may be used as function arguments and return values.

function-values.go

package main
import (
    "fmt"
    "math"
)
func compute(fn func(float64, float64) float64) float64 {
    return fn(3, 4)
}
func main() {
    hypot := func(x, y float64) float64 {
        return math.Sqrt(x*x + y*y)
    }
    fmt.Println(hypot(5, 12))
    fmt.Println(compute(hypot))
    fmt.Println(compute(math.Pow))
}