Which lookup method is faster on small dataset? switch or if or map?

README.md

Lookup Benchmark Results

$ go test -bench=. -benchtime=5s 
goos: darwin
goarch: amd64
pkg: github.com/rocketspacer/lookupbm
BenchmarkLookUp/ValueExists@Head/Switch-8       1000000000               6.39 ns/op
BenchmarkLookUp/ValueExists@Head/IfElse-8       10000000000              1.86 ns/op
BenchmarkLookUp/ValueExists@Head/Map-8          1000000000               9.86 ns/op
BenchmarkLookUp/ValueExists@End/Switch-8        1000000000               7.28 ns/op
BenchmarkLookUp/ValueExists@End/IfElse-8        1000000000               6.00 ns/op
BenchmarkLookUp/ValueExists@End/Map-8           1000000000              10.6 ns/op
BenchmarkLookUp/ValueDoesntExist/Switch-8       2000000000               3.93 ns/op
BenchmarkLookUp/ValueDoesntExist/IfElse-8       2000000000               6.00 ns/op
BenchmarkLookUp/ValueDoesntExist/Map-8          500000000               13.2 ns/op
PASS
ok      github.com/rocketspacer/lookupbm 91.962s

$ go test -bench=. -benchtime=5s
goos: darwin
goarch: amd64
pkg: github.com/rocketspacer/lookupbm
BenchmarkLookUp/ValueExists@Head/Switch-8       1000000000               6.39 ns/op
BenchmarkLookUp/ValueExists@Head/IfElse-8       10000000000              1.88 ns/op
BenchmarkLookUp/ValueExists@Head/Map-8          1000000000               9.78 ns/op
BenchmarkLookUp/ValueExists@End/Switch-8        1000000000               6.53 ns/op
BenchmarkLookUp/ValueExists@End/IfElse-8        1000000000               6.34 ns/op
BenchmarkLookUp/ValueExists@End/Map-8           1000000000              10.8 ns/op
BenchmarkLookUp/ValueDoesntExist/Switch-8       2000000000               3.93 ns/op
BenchmarkLookUp/ValueDoesntExist/IfElse-8       2000000000               6.02 ns/op
BenchmarkLookUp/ValueDoesntExist/Map-8          500000000               12.8 ns/op
PASS
ok      github.com/rocketspacer/lookupbm 91.421s

$ go test -bench=. -benchtime=5s
goos: darwin
goarch: amd64
pkg: github.com/rocketspacer/lookupbm
BenchmarkLookUp/ValueExists@Head/Switch-8       1000000000               6.31 ns/op
BenchmarkLookUp/ValueExists@Head/IfElse-8       10000000000              1.79 ns/op
BenchmarkLookUp/ValueExists@Head/Map-8          1000000000               9.35 ns/op
BenchmarkLookUp/ValueExists@End/Switch-8        1000000000               6.33 ns/op
BenchmarkLookUp/ValueExists@End/IfElse-8        2000000000               5.95 ns/op
BenchmarkLookUp/ValueExists@End/Map-8           1000000000              11.7 ns/op
BenchmarkLookUp/ValueDoesntExist/Switch-8       2000000000               3.91 ns/op
BenchmarkLookUp/ValueDoesntExist/IfElse-8       2000000000               5.85 ns/op
BenchmarkLookUp/ValueDoesntExist/Map-8          500000000               12.5 ns/op
PASS
ok      github.com/rocketspacer/lookupbm 96.056s

lookup_test.go

package lookup_test

import "testing"

var globalMap = map[string]bool{
	"GET":     true,
	"HEAD":    true,
	"POST":    true,
	"PUT":     true,
	"DELETE":  true,
	"CONNECT": true,
	"OPTIONS": true,
	"TRACE":   true,
	"PATCH":   true,
}

func noop() {
	a := 1
	_ = a + 1
}

func doSwitchLookup(value string) {
	switch value {
	case "GET":
		noop()
	case "HEAD":
		noop()
	case "POST":
		noop()
	case "PUT":
		noop()
	case "DELETE":
		noop()
	case "CONNECT":
		noop()
	case "OPTIONS":
		noop()
	case "TRACE":
		noop()
	case "PATCH":
		noop()
	default:
		noop()
	}
}

func doIfElseLookup(value string) {
	if value == "GET" {
		noop()
	} else if value == "HEAD" {
		noop()
	} else if value == "POST" {
		noop()
	} else if value == "PUT" {
		noop()
	} else if value == "DELETE" {
		noop()
	} else if value == "CONNECT" {
		noop()
	} else if value == "OPTIONS" {
		noop()
	} else if value == "TRACE" {
		noop()
	} else if value == "PATCH" {
		noop()
	} else {
		noop()
	}
}

func doMapLookup(value string) {
	_ = globalMap[value]
	noop()
}

func BenchmarkLookUp(b *testing.B) {
	b.Run("ValueExists@Head", func(b *testing.B) {
		value := "GET"

		b.Run("Switch", func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				doSwitchLookup(value)
			}
		})

		b.Run("IfElse", func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				doIfElseLookup(value)
			}
		})

		b.Run("Map", func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				doMapLookup(value)
			}
		})
	})

	b.Run("ValueExists@End", func(b *testing.B) {
		value := "PATCH"

		b.Run("Switch", func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				doSwitchLookup(value)
			}
		})

		b.Run("IfElse", func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				doIfElseLookup(value)
			}
		})

		b.Run("Map", func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				doMapLookup(value)
			}
		})
	})

	b.Run("ValueDoesntExist", func(b *testing.B) {
		value := "LOOKATME"

		b.Run("Switch", func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				doSwitchLookup(value)
			}
		})

		b.Run("IfElse", func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				doIfElseLookup(value)
			}
		})

		b.Run("Map", func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				doMapLookup(value)
			}
		})
	})
}