[Go] Higher-order function: partition

package main

import (
    "log"
)

func partition(arr []int, predicate func(int) bool) ([]int, []int) {
    fit := make([]int, 0)
    nonfit := make([]int, 0)

    for _, e := range arr {
        if predicate(e) {
            fit = append(fit, e)
        } else {
            nonfit = append(nonfit, e)
        }
    }

    return fit, nonfit
}

// eq declared as before.

func main() {
    arr := []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}

    even, odd := partition(arr, func(n int) bool { return n%2 == 0 })

    if !eq(even, []int{2, 4, 6, 8, 10}) {
        log.Fatal("Wrong value")
    }

    if !eq(odd, []int{1, 3, 5, 7, 9}) {
        log.Fatal("Wrong value")
    }
}