concatenate_test.go

package concatenate_test

import (
	"strings"
	"testing"
)

func Concatenate(texts []string) string {
	s := ""
	for _, value := range texts {
		s += value
	}
	return s
}

func ConcatenateUsingStringsBuilderWithoutGrow(texts []string) string {
	sb := strings.Builder{}
	for _, v := range texts {
		_, _ = sb.WriteString(v)
	}
	return sb.String()
}

func ConcatenateUsingStringsBuilderWithGrow(texts []string) string {
	count := 0
	for i := 0; i < len(texts); i++ {
		count += len(texts[i])
	}
	sb := strings.Builder{}
	sb.Grow(count)
	for _, v := range texts {
		_, _ = sb.WriteString(v)
	}
	return sb.String()
}

func BenchmarkConcatenate(b *testing.B) {
	for i := 0; i < b.N; i++ {
		Concatenate([]string{"The", "sea", "is", "a", "vast", "and", "mysterious", "place,", "full", "of", "life", "and", "beauty.", "Its", "depths", "are", "filled", "with", "untold", "secrets", "and", "wonders,", "and", "its", "surface", "is", "an", "ever-changing", "canvas", "of", "blues,", "greens,", "and", "greys.", "From", "the", "gentle", "lapping", "of", "the", "waves", "to", "the", "powerful", "roar", "of", "the", "ocean,", "the", "sea", "is", "a", "source", "of", "endless", "fascination", "and", "delight.", "Its", "power", "and", "beauty", "have", "inspired", "poets,", "writers,", "and", "artists", "for", "centuries,", "and", "its", "mysteries", "still", "captivate", "us", "today.", "Whether", "youre", "relaxing", "on", "a", "beach", "or", "exploring", "the", "depths", "of", "the", "ocean,", "the", "sea", "is", "sure", "to", "bring", "a", "sense", "of", "awe", "and", "wonder."})
	}
}

func BenchmarkConcatenateUsingStringsBuilderWithoutGrow(b *testing.B) {
	for i := 0; i < b.N; i++ {
		ConcatenateUsingStringsBuilderWithoutGrow([]string{"The", "sea", "is", "a", "vast", "and", "mysterious", "place,", "full", "of", "life", "and", "beauty.", "Its", "depths", "are", "filled", "with", "untold", "secrets", "and", "wonders,", "and", "its", "surface", "is", "an", "ever-changing", "canvas", "of", "blues,", "greens,", "and", "greys.", "From", "the", "gentle", "lapping", "of", "the", "waves", "to", "the", "powerful", "roar", "of", "the", "ocean,", "the", "sea", "is", "a", "source", "of", "endless", "fascination", "and", "delight.", "Its", "power", "and", "beauty", "have", "inspired", "poets,", "writers,", "and", "artists", "for", "centuries,", "and", "its", "mysteries", "still", "captivate", "us", "today.", "Whether", "youre", "relaxing", "on", "a", "beach", "or", "exploring", "the", "depths", "of", "the", "ocean,", "the", "sea", "is", "sure", "to", "bring", "a", "sense", "of", "awe", "and", "wonder."})
	}
}


func BenchmarkConcatenateUsingStringsBuilderWithGrow(b *testing.B) {
	for i := 0; i < b.N; i++ {
		ConcatenateUsingStringsBuilderWithGrow([]string{"The", "sea", "is", "a", "vast", "and", "mysterious", "place,", "full", "of", "life", "and", "beauty.", "Its", "depths", "are", "filled", "with", "untold", "secrets", "and", "wonders,", "and", "its", "surface", "is", "an", "ever-changing", "canvas", "of", "blues,", "greens,", "and", "greys.", "From", "the", "gentle", "lapping", "of", "the", "waves", "to", "the", "powerful", "roar", "of", "the", "ocean,", "the", "sea", "is", "a", "source", "of", "endless", "fascination", "and", "delight.", "Its", "power", "and", "beauty", "have", "inspired", "poets,", "writers,", "and", "artists", "for", "centuries,", "and", "its", "mysteries", "still", "captivate", "us", "today.", "Whether", "youre", "relaxing", "on", "a", "beach", "or", "exploring", "the", "depths", "of", "the", "ocean,", "the", "sea", "is", "sure", "to", "bring", "a", "sense", "of", "awe", "and", "wonder."})
	}
}


// $ go test -bench=. 
// goos: darwin
// goarch: amd64
// pkg: my_go/concatenate
// cpu: VirtualApple @ 2.50GHz
// BenchmarkConcatenate-10                                           143859              7081 ns/op
// BenchmarkConcatenateUsingStringsBuilderWithoutGrow-10            1412930               853.5 ns/op
// BenchmarkConcatenateUsingStringsBuilderWithGrow-10               2135326               558.9 ns/op
// PASS
// ok      my_go/concatenate       5.457s