main.go 源码
// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials : https://learngoprogramming.com
// In-person training : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus
package main
import (
"bytes"
"fmt"
"testing"
"unicode"
"unicode/utf8"
)
/*
Let's run this program to see the speed differences.
benchDecoder 30000000 46.2 ns/op --> BEST
benchForRange 30000000 53.0 ns/op --> MEDIOCRE
benchConcater 20000000 93.7 ns/op --> WORST
*/
var word = []byte("öykü")
func decoder(w []byte) {
_, size := utf8.DecodeRune(word)
copy(w[:size], bytes.ToUpper(w[:size]))
}
func forRange(w []byte) {
var size int
for i := range string(w) {
if i > 0 {
size = i
break
}
}
copy(w[:size], bytes.ToUpper(w[:size]))
}
var globalString string
func concater(w []byte) {
runes := []rune(string(w))
runes[0] = unicode.ToUpper(runes[0])
globalString = string(runes)
}
func bench(technique func([]byte)) testing.BenchmarkResult {
return testing.Benchmark(func(b *testing.B) {
for i := 0; i < b.N; i++ {
technique(word)
}
})
}
func main() {
fmt.Println("benchDecoder", bench(decoder))
fmt.Println("benchForRange", bench(forRange))
fmt.Println("benchConcater", bench(concater))
}
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