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This article mainly introduces how to efficiently assemble strings in Golang language, which has a certain reference value, and interested friends can refer to it. I hope you will gain a lot after reading this article.

01. Introduction

In programming languages, strings are an important data structure. In the Golang language, because strings can only be accessed and cannot be modified, Golang needs to make a memory copy if we do string concatenation in the Golang language.

If readers have learned about memory management in the Golang language, they will know that memory copying can lead to performance consumption. In Golang language, there are many ways of string concatenation. In order to reduce the performance loss of our program, we introduce the characteristics of each string concatenation method, so as to learn to choose the best string concatenation method according to different scenarios.

02, operator +

The use of operator + concatenation string is the simplest way of string concatenation, which is characterized by strong readability, but general performance, because each stitching involves a copy of memory and a new piece of memory needs to be allocated. and this method is only applicable to variables of string type. Therefore, this method is suitable for string concatenation scenarios with a small number of variables of string type.

Sample code:

Str: = "a" + "b" + "c" 03, strings.Join method

The Join method in the standard library strings, which can only be used to splice slices of string type. Each element in a slice of string type is spliced into a string. It is suitable for scenes where elements in slices of string type are stitched together.

Sample code:

S: = [] string {"a", "b", "c"} str: = strings.Join (s, ",") 04, fmt.Sprint method

The Sprint,Sprintf and Sprintln methods in the standard library fmt are also a commonly used string concatenation method. It is characterized by the ability to concatenate other types, involving type conversion, and the underlying implementation uses [] byte byte slices, but the performance is mediocre, so this method is suitable for scenarios that contain a small number of variables of other non-string types for string concatenation.

Sample code:

Str: = fmt.Sprint ("a", 1, "b\ r\ n") str1: = fmt.Sprintf ("name:%s,age=%d.\ r\ n", "lucy", 17) str2: = fmt.Sprintln ("a", 1, "b") 05, bytes.Buffer type

The Buffer type in the standard library bytes, in which the WriteString method and the String method are used together to realize string concatenation. It is characterized by the ability to concatenate strings, characters and Unicode. The underlying implementation uses [] byte, but it involves the conversion between string and [] byte. The performance is general, because the buffer used by the WriteString method is too long, which will lead to panic. This method is suitable for string concatenation of a small number of character variables and string variables.

Sample code:

Var b bytes.Bufferb.WriteString ("My") b.WriteString ("name") b.WriteString ("is") b.WriteString ("lucy.") str: = b.String () 06, strings.Builder type

The Builder type in the standard library strings, in which the WriteString method is used in conjunction with the String method to achieve string stitching in the same way as bytes.Buffer. It can concatenate strings, characters and Unicode, and also involves the conversion between string and [] byte. However, it uses unsafe.Pointer to optimize the conversion between string and [] byte, so this method is recommended for a large number of string stitching scenarios.

Sample code:

Var b bytes.Builerb.WriteString ("My") b.WriteString ("name") b.WriteString ("is") b.WriteString ("lucy.") str: = b.String () Thank you for reading this article carefully. I hope the article "how to efficiently assemble strings in Golang language" shared by the editor will be helpful to you. At the same time, I hope you will support us, pay attention to the industry information channel, and more related knowledge is waiting for you to learn!

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