Compare perfect hash function performance with `IsKeyword()` method

token_test.go

package main

import (
	"go/token"
	"testing"
)

func BenchmarkIsKeyword(b *testing.B) {
	for n := 0; n < b.N; n++ {
		for i := token.BREAK; i < token.VAR; i++ {
			tokenStr := i.String()
			token.IsKeyword(tokenStr)
		}
	}
}

func isKeyword(name string) bool {
	switch name {
	case "break":
		fallthrough
	case "case":
		fallthrough
	case "chan":
		fallthrough
	case "const":
		fallthrough
	case "continue":
		fallthrough
	case "default":
		fallthrough
	case "defer":
		fallthrough
	case "else":
		fallthrough
	case "fallthrough":
		fallthrough
	case "for":
		fallthrough
	case "func":
		fallthrough
	case "go":
		fallthrough
	case "goto":
		fallthrough
	case "if":
		fallthrough
	case "import":
		fallthrough
	case "interface":
		fallthrough
	case "map":
		fallthrough
	case "package":
		fallthrough
	case "range":
		fallthrough
	case "return":
		fallthrough
	case "select":
		fallthrough
	case "struct":
		fallthrough
	case "switch":
		fallthrough
	case "type":
		fallthrough
	case "var":
		return true
	default:
		return false
	}
}

func BenchmarkPerfectHashFunction(b *testing.B) {
	for n := 0; n < b.N; n++ {
		for i := token.BREAK; i < token.VAR; i++ {
			tokenStr := i.String()
			token.IsKeyword(tokenStr)
		}
	}
}