How Go uses byte arrays or buffers to speed up string concatenation

This article will explain in detail how Go can use byte arrays or buffers to improve the speed of string concatenation. I think it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

Using byte arrays or buffers can increase the speed of string concatenation

In Go, strings are read-only, which means that every time you use str = str + "something", you actually create a new string object. If you seek the maximum efficiency of your code, you should use byte buffers instead, such as:

Package mainimport ("bytes"fmt") func main () {str: = "something" buf: = bytes.NewBufferString (str) for I: = 0; I < 1000; iTunes + {buf.Write ([] byte (randomString ())} fmt.Println (buf.String ())} func randomString () string {ret: = "pretend-this-is-random" return ret}

Using byte arrays will further improve the efficiency of the above code, but you need to know the size of the final string. An intuitive example is the left-pad implementation in the Go language.

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