[Go] Higher-order function demo.

package main

import (
    "fmt"
)

func apply(arr []float64, callback func(float64) float64) []float64 {
    out := make([]float64, len(arr))

    for i, e := range arr {
        out[i] = callback(e)
    }

    return out
}

func main() {
    arr := []float64{1, 2, 3, 4, 5}

    // Square
    sqr := apply(arr, func(n float64) float64 { return n * n })
    fmt.Println(sqr)

    // Cubic
    cub := apply(arr, func(n float64) float64 { return n * n * n })
    fmt.Println(cub)

    // Inverse
    inv := apply(arr, func(n float64) float64 { return 1.0 / n })
    fmt.Println(inv)
}