SOLVED: Learning go, how to simmer this down?

[Coffee]

I’m in the process of learning go. The below code is an experiment and pretty much self explanatory. It produces the expected result.

package main

import "fmt"

func main() {
	a := []int{1, 2, 3}
	z := map[string]func(x int) []int{
		"add": func(x int) (b []int) {
			b = a
			for k, _ := range b {
				b[k] += x
			}
			return
		},
		"sub": func(x int) (b []int) {
			b = a
			for k, _ := range b {
				b[k] -= x
			}
			return
		},
	}
	fmt.Println("add 3:", z["add"](3))
	fmt.Println("sub 100:", z["sub"](100))
}

I think the b = a can be eliminated while keeping the same behavior, but how?

I want to practice my understanding of slices, maps, and anonymous functions, so that’s why I took this approach.

NOTE: I want to iterate over the whole a slice whether it’s 3 items or 100.

EDIT: Stack overflow to the rescue!. It basically comes down to the fact I didn’t need the reassignment at all and I was on the right track with using indexes. Here’s what I ended up with:

package main

import "fmt"

func main() {
	a := []int{1, 2, 3}
	z := map[string]func(x int) []int{
		"add": func(x int) []int {
			for k, _ := range a {
				a[k] += x
			}
			return a
		},
		"sub": func(x int) []int {
			for k, _ := range a {
				a[k] -= x
			}
			return a
		},
	}
	fmt.Println("add 3:", z["add"](3))
	fmt.Println("sub 100:", z["sub"](100))
}