58 lines
1.0 KiB
Go
58 lines
1.0 KiB
Go
package main
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import (
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"bytes"
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"fmt"
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"testing"
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"unicode"
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"unicode/utf8"
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)
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/*
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Let's run this program to see the speed differences.
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benchDecoder 30000000 46.2 ns/op --> BEST
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benchForRange 30000000 53.0 ns/op --> MEDIOCRE
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benchConcater 20000000 93.7 ns/op --> WORST
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*/
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var word = []byte("öykü")
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func decoder(w []byte) {
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_, size := utf8.DecodeRune(word)
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copy(w[:size], bytes.ToUpper(w[:size]))
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}
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func forRange(w []byte) {
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var size int
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for i := range string(w) {
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if i > 0 {
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size = i
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break
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}
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}
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copy(w[:size], bytes.ToUpper(w[:size]))
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}
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var globalString string
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func concater(w []byte) {
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runes := []rune(string(w))
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runes[0] = unicode.ToUpper(runes[0])
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globalString = string(runes)
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}
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func bench(technique func([]byte)) testing.BenchmarkResult {
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return testing.Benchmark(func(b *testing.B) {
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for i := 0; i < b.N; i++ {
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technique(word)
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}
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})
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}
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func main() {
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fmt.Println("benchDecoder", bench(decoder))
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fmt.Println("benchForRange", bench(forRange))
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fmt.Println("benchConcater", bench(concater))
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}
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