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
Themost 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!’.
Astring literal holds a valid UTF-8 sequences called runes. A String holds arbitrary bytes.
/**
* file: main.go
* author: pottercoding.cn 程序员波特,程序员编程资料站(pottercoding.cn)
* Copyright © 2015-2065 pottercoding.cn. 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: pottercoding.cn 程序员波特,程序员编程资料站(pottercoding.cn)
* Copyright © 2015-2065 pottercoding.cn. 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
Thestrings 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.
Letus look at the following example −
/**
* file: main.go
* author: pottercoding.cn 程序员波特,程序员编程资料站(pottercoding.cn)
* Copyright © 2015-2065 pottercoding.cn. 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!