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Strings, which are widely used in Go programming, are a readonly slice of bytes. In the Go programming language, strings are slices . The Go platform provides various libraries to manipulate strings. – unicode – regexp – strings
Creating Strings
The most direct way to create a string is to write −
var greeting = "Hello world!"
Whenever it encounters a string literal in your code, the compiler creates a string object with its value in this case, “Hello world!’.
A string literal holds a valid UTF-8 sequences called runes. A String holds arbitrary bytes.
/**
* file: main.go
* author: 搜云库技术团队(tech.souyunku.com)
* Copyright © 2015-2065 tech.souyunku.com. All rights reserved.
*/
package main
import "fmt"
func main() {
var greeting = "Hello world!"
fmt.Printf("normal string: ")
fmt.Printf("%s", greeting)
fmt.Printf("\n")
fmt.Printf("hex bytes: ")
for i := 0; i < len(greeting); i++ {
fmt.Printf("%x ", greeting[i])
}
fmt.Printf("\n")
const sampleText = "\xbd\xb2\x3d\xbc\x20\xe2\x8c\x98"
/*q flag escapes unprintable characters, with + flag it escapses non-ascii
characters as well to make output unambigous
*/
fmt.Printf("quoted string: ")
fmt.Printf("%+q", sampleText)
fmt.Printf("\n")
}
This would produce the following result −
normal string: Hello world!
hex bytes: 48 65 6c 6c 6f 20 77 6f 72 6c 64 21
quoted string: "\xbd\xb2=\xbc \u2318"
Note − The string literal is immutable, so that once it is created a string literal cannot be changed.
String Length
len(str) method returns the number of bytes contained in the string literal.
/**
* file: main.go
* author: 搜云库技术团队(tech.souyunku.com)
* Copyright © 2015-2065 tech.souyunku.com. All rights reserved.
*/
package main
import "fmt"
func main() {
var greeting = "Hello world!"
fmt.Printf("String Length is: ")
fmt.Println(len(greeting))
}
This would produce the following result −
String Length is : 12
Concatenating Strings
The strings package includes a method join for concatenating multiple strings −
strings.Join(sample, " ")
Join concatenates the elements of an array to create a single string. Second parameter is seperator which is placed between element of the array.
Let us look at the following example −
/**
* file: main.go
* author: 搜云库技术团队(tech.souyunku.com)
* Copyright © 2015-2065 tech.souyunku.com. All rights reserved.
*/
package main
import ("fmt" "math" )"fmt" "strings")
func main() {
greetings := []string{"Hello","world!"}
fmt.Println(strings.Join(greetings, " "))
}
This would produce the following result −
Hello world!
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附录：GOlang 教程：系列文章
- 一、Go 语言基础教程
- 二、Go 语言 – 简介
- 三、Go 语言环境配置
- 四、Go 语言结构
- 五、Go 语言基础语法
- 六、Go 语言数据类型
- 七、Go 语言变量
- 八、Go 语言常量
- 九、Go 语言运算符
- 十、Go 语言条件语句
- 十一、Go 语言循环语句
- 十二、Go 语言函数
- 十三、Go 语言 – 变量作用域
- 十四、Go 语言 – 数组
- 【当前读到】十五、Go 语言 – 字符串
- 十六、Go 语言 – 指针
- 十七、Go 语言 – 结构体
- 十八、Go 语言 – 数据类型 interface
- 十九、Go 语言 – 切片(slice)
- 二十、Go 语言 – 哈希表(map)
- 二十一、Go 语言 – range 关键字
- 二十二、Go 语言 – 关键字 delete
- 二十三、Go 语言递归函数
- 二十四、Go 语言 – 类型转换
- 二十五、Go 语言 – 错误处理
- 二十六、Go 语言 – 开发工具
- 二十七、Go 语言 for 循环语句
- 二十八、Go 语言 – 多维数组
- 二十九、Go 语言 break 语句
- 三十、Go 语言 – 指向指针的指针
- 三十一、Go 语言 – 指针作为函数参数
- 三十二、Go 语言 goto 语句
- 三十三、Go 语言 if 语句
- 三十四、Go 语言函数值传递调用
- 三十五、Go 语言 for 循环嵌套
- 三十六、Go 语言 – 向函数传递数组
- 三十七、Go 语言 – 函数 – 引用传值
- 三十八、Go 语言 select 语句
- 三十九、Go 语言 if…else 语句
- 四十、Go 语言 switch 语句
- 四十一、Go 语言 – 闭包函数
- 四十二、Go 语言指针数组
- 四十三、Go 语言 if 语句嵌套
- 四十四、Go 语言 – 函数作为值
- 四十五、Go 语言函数方法
- 四十六、Go 语言 continue 语句
