24 lines
530 B
Go
24 lines
530 B
Go
package main
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import (
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"fmt"
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"strings"
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"time"
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)
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func main() {
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const loopCount = 100000 // 10万次拼接
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var builder strings.Builder
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// 预分配内存（预估每个item占10字节，避免动态扩容）
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builder.Grow(loopCount * 10)
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start := time.Now()
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for i := 0; i < loopCount; i++ {
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fmt.Fprintf(&builder, "item_%d,", i) // 直接写入缓冲区，无临时字符串
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}
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result := builder.String()
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fmt.Printf("strings.Builder拼接耗时：%v\n", time.Since(start))
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_ = result // 避免未使用变量警告
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}
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