Concatenating Strings in Go Efficiently

Adler Hsieh

Adler Hsieh


It's common to concatenate a series of strings to a target string. In Go, we can do it simply by:

func concatenate() string {
    target := ""
    strings := []string{"foo", "bar", "baz"}

    for _, string := range strings {
        target += string
    }

    return target
}

However, It can be taken to another level for better performance. We use bytes package to create a buffer, and then write every string to it before we return it as a String.

import "bytes"

func concatenate() string {
    var buffer bytes.Buffer
    strings := []string{"foo", "bar", "baz"}

    for _, string := range strings {
        buffer.WriteString(string)
    }

    return buffer.String()
}

Reference

How to Efficiently Concatenate Strings in Go

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