(go) combine two array and keep order

combineAndKeepOrder.go

package main

import "log"

func main() {
	result := combineAndKeepOrder([]string{"a", "b", "c"}, []string{"c", "a", "d"})
	log.Println(result, testEq(result, []string{"c", "b", "a", "d"}))

	result = combineAndKeepOrder([]string{}, []string{"c", "a", "d"})
	log.Println(result, testEq(result, []string{"c", "a", "d"}))

	result = combineAndKeepOrder([]string{"a", "b", "c"}, []string{"d", "a", "c"})
	log.Println(result, testEq(result, []string{"d", "b", "a", "c"}))

	result = combineAndKeepOrder([]string{"a", "b", "c"}, []string{})
	log.Println(result, testEq(result, []string{"a", "b", "c"}))
}

func combineAndKeepOrder(origins []string, new []string) []string {
	position := 0
	for idxO, k := range origins {
		for _, v := range new {
			if v == k {
				origins[idxO] = new[position]
				position++
				break
			}
		}
	}
	if position < len(new) {
		origins = append(origins, new[position:]...)
	}
	return origins
}

func testEq(a, b []string) bool {
	if len(a) != len(b) {
		return false
	}
	for i := range a {
		if a[i] != b[i] {
			return false
		}
	}
	return true
}