How to modify string in golang

Golang string modification methods are: 1. Through string cutting and splicing, use the Split function in the strings package to cut the string into slices, and then modify the string by splicing elements in the slices; 2 , modified using a byte array, modified by converting the string to a byte array.

The operating environment of this tutorial: windows10 system, golang1.20.1 version, DELL G3 computer.

Golang is a modern programming language that is simple and efficient and is widely used in fields such as web development and system programming. In Golang, string is an immutable data type, which means that once a string is defined, its content cannot be modified directly. However, there are ways we can modify or manipulate strings.

1. Through string cutting and splicing

Strings in Golang can be modified by cutting and splicing. For example, assuming we have a string s that contains underscores, we can use the Split function from the strings package to cut the string into slices and then modify the string by splicing the elements in the slices. An example is as follows:

import(
"fmt"
"strings"
)
funcmain(){
s:="hello_world"
arr:=strings.Split(s,"_")
arr[1]="golang"
newStr:=strings.Join(arr,"_")
fmt.Println(newStr)
}

In the above code, we first use the Split function in the strings package to cut the string s according to underscores and obtain a slice arr. Then, we modify the second element in the slice arr to "golang", and finally use the Join function in the strings package to splice the modified slice into the string newStr. By printing newStr, we can see that the output result is "hello_golang" and the string has been successfully modified.

2. Use byte arrays for modification

In addition to string cutting and splicing, we can also modify strings by converting them into byte arrays. In Golang, strings are actually composed of byte arrays, so we can modify the contents of the string by operating on byte arrays. An example is as follows:

import(
"fmt"
)
funcmain(){
s:="hello"
bytes:=[]byte(s)
bytes[1]='a'
newStr:=string(bytes)
fmt.Println(newStr)
}

In the above code, we first define the string s as "hello", and then convert it into the byte array bytes. Next, we modify the string by modifying the second element in the byte array bytes to the character 'a'. Finally, we convert the modified byte array back to the string newStr and print it. The output result is "hallo".

It should be noted that since strings in Golang are immutable, when modifying a string, a new string object is actually created. Therefore, there may be some impact on performance.

In summary, string in Golang is an immutable data type and its content cannot be modified directly. But we can modify the string by cutting and splicing, or by converting the string to a byte array. The above are several common methods for modifying strings in Golang. In practical applications, choose the appropriate method according to specific needs to achieve the purpose of modifying the string. .

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