Ilya Basov

package main

import (
    "fmt"
    "math"
)

func main() {

    f := poly([]float64{1, 2, 3, 4})

    fmt.Println(f(2))
}

func poly(a []float64) func(float64) float64 {

    return func(x float64) (res float64) {

        for i, aa := range a {
            res += aa * math.Pow(x, float64(len(a)-(i+1)))
        }
        return

    }
}