If/Else vs Switch

main.go

package main

import "strconv"

func Switch(n int) string {
	code := strconv.Itoa(n)

	switch {
	case n >= 500:
		code = ">=500"
	case n >= 400:
		code = ">=400"
	case n >= 300:
		code = ">=300"
	}

	return code
}

func If(n int) string {
	code := strconv.Itoa(n)

	if n >= 500 {
		code = ">=500"
	} else if n >= 400 {
		code = ">=400"
	} else if n >= 300 {
		code = ">=300"
	}

	return code
}

main_test.go

package main

import "testing"

func BenchmarkSwitch(b *testing.B) {
	for n := 0; n < b.N; n++ {
		Switch(200)
		Switch(300)
		Switch(400)
		Switch(500)
	}
}

func BenchmarkIf(b *testing.B) {
	for n := 0; n < b.N; n++ {
		If(200)
		If(300)
		If(400)
		If(500)
	}
}

output

BenchmarkSwitch	10000000	       226 ns/op
BenchmarkIf	10000000	       224 ns/op