map_switch_test.go

package golang

import "testing"

var lookupMap = map[string]int{
	"Constant":  1,
	"Bool":      2,
	"Byte":      3,
	"I16":       4,
	"I32":       5,
	"I64":       6,
	"Double":    7,
	"String":    8,
	"Binary":    9,
	"Map":       10,
	"List":      11,
	"Set":       12,
	"Enum":      13,
	"Struct":    14,
	"Union":     15,
	"Exception": 16,
	"Typedef":   17,
	"Service":   18,
}

func lookupFunc1(s string) (int, bool) {
	v, ok := lookupMap[s]
	if !ok {
		return 0, false
	}
	return v, true
}

func lookupFunc2(s string) (int, bool) {
	switch s {
	case "Constant":
		return 1, true
	case "Bool":
		return 2, true
	case "Byte":
		return 3, true
	case "I16":
		return 4, true
	case "I32":
		return 5, true
	case "I64":
		return 6, true
	case "Double":
		return 7, true
	case "String":
		return 8, true
	case "Binary":
		return 9, true
	case "Map":
		return 10, true
	case "List":
		return 11, true
	case "Set":
		return 12, true
	case "Enum":
		return 13, true
	case "Struct":
		return 14, true
	case "Union":
		return 15, true
	case "Exception":
		return 16, true
	case "Typedef":
		return 17, true
	case "Service":
		return 18, true
	}
	return 0, false
}

var (
	ks = []string{"Constant", "Bool", "Byte", "I16", "I32", "I64",
		"Double", "String", "Map", "List", "Set", "Enum", "Struct", "Union", "Exception", "Typedef", "Service",

		"Service", "Service", "Service", "Service", "Service", "Service", "Service", "Service", "Service", "Service", "Service", "Service",
	}
)

func BenchmarkLookup1(b *testing.B) {

	var (
		rv int
		re bool
	)
	for i := 0; i < b.N; i++ {
		for _, k := range ks {
			rv, re = lookupFunc1(k)
		}
	}
	_, _ = rv, re
}

func BenchmarkLookup2(b *testing.B) {
	var (
		rv int
		re bool
	)
	for i := 0; i < b.N; i++ {
		for _, k := range ks {
			rv, re = lookupFunc2(k)
		}
	}
	_, _ = rv, re
}

// BenchmarkLookup1-12    	 7509818	       157.3 ns/op	       0 B/op	       0 allocs/op
// BenchmarkLookup1-12    	 4537228	       266.9 ns/op	       0 B/op	       0 allocs/op

// BenchmarkLookup2-12    	13033747	        90.41 ns/op	       0 B/op	       0 allocs/op
// BenchmarkLookup2-12    	10001810	       122.0 ns/op	       0 B/op	       0 allocs/op