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Go - Strings


Strings, which are widely used in Go programming, are a readonly slice of bytes.

In the Go programming language, strings are slices.
  • 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.
package main

import "fmt"

func main() {
   var greeting =  "Hello world Welookups!"
   
   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 -
$go run main.go
normal string: Hello world Welookups!
hex bytes: 48 65 6c 6c 6f 20 77 6f 72 6c 64 20 57 65 6c 6f 6f 6b 75 70 73 21 
quoted string: "\xbd\xb2=\xbc \u2318"

String Length

len(str) method returns the number of bytes contained in the string literal.
package main

import "fmt"

func main() {
   var greeting =  "Hello world Welookups!"
   
   fmt.Printf("String Length is: ")
   fmt.Println(len(greeting))  
}
This would produce the following result

$go run main.go
String Length is: 22

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
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!