How to modify string in Golang

Golang is a popular programming language suitable for many different application development tasks. In this article, we will explore how to modify strings in Golang.

First of all, we need to clarify a concept: in Golang, strings are immutable. This means that we cannot make modifications directly on the string, but instead need to create a new string to hold the changes.

So how to modify the string? There are several ways to do this.

The first method is to use string concatenation. This method requires splitting the original string into two substrings and replacing one of the substrings with the modified string. This can be achieved by using the " " operator. For example:

str := "hello world"
newstr := "new"
result := newstr + str[3:]
fmt.Println(result)

In this example, we split the original string into "he" and "llo world". We then add "new" to "he" and concatenate the result with the "llo world" substring. The end result is "newlo world".

The second method is to use string slicing. This method can directly modify a character or a series of characters in the string. For example:

str := "hello world"
chars := []rune(str)
chars[0] = 'j'
result := string(chars)
fmt.Println(result)

In this example, we convert the string into a slice of type rune so that we can modify it. We then change the first character "h" to "j" and convert the result back to string type.

The third method is to use the functions in the string package. For example, we can use the strings.Replace function to replace a substring in a string. For example:

import "strings"

str := "hello world"
old := "world"
new := "everyone"
result := strings.Replace(str, old, new, -1)
fmt.Println(result)

In this example, we use the strings.Replace function to replace the "world" substring in the string with "everyone".

In summary, although strings cannot be modified directly in Golang, there are many ways to modify strings. It is necessary to choose the appropriate method according to the specific situation.

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