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Golang Strings

Learn about the Go language strings, creating and accessing of strings, other string operations with examples.
Submitted by IncludeHelp, on January 05, 2022

Strings in Golang

  • A string is a slice of bytes that is represented in Unicode text using UTF-8 encoding.
  • Strings are immutable structures, i.e. they are read-only values.
  • The working of strings in Golang is different from that of other programming languages as it is treated as a slice of bytes.
  • Strings are enclosed in double-quotes "".
    Example: "includehelp.com"

Creating a string

We can create a string in Go using the following syntax,

string_name := "string_value"

Here,

  • string_name is the name given to the string.
  • string_value is the value of the string.

Example:

name := "Shivang Yadav"

Example 1: Golang program to create and print a string

package main

import "fmt"

func main() {
	// creating a String
	myString := "Golang programming language"

	// printing the String value
	fmt.Println(myString)
}

Output:

Golang programming language

Iterating over characters of the string

String in Golang is a slice due to which the program can iterator over the string using a loop.

Example 2: Golang program to iterate over the characters of the string

package main

import "fmt"

func main() {
	// Creating a String
	myString := "Hello, world! How are you?"

	fmt.Printf("The string is %s\n", myString)

	// Iterating
	for index, s := range myString {
		fmt.Printf("index -> %d : chatacter -> %c \n", index, s)
	}
}

Output:

The string is Hello, world! How are you?
index -> 0 : chatacter -> H 
index -> 1 : chatacter -> e 
index -> 2 : chatacter -> l 
index -> 3 : chatacter -> l 
index -> 4 : chatacter -> o 
index -> 5 : chatacter -> , 
index -> 6 : chatacter ->   
index -> 7 : chatacter -> w 
index -> 8 : chatacter -> o 
index -> 9 : chatacter -> r 
index -> 10 : chatacter -> l 
index -> 11 : chatacter -> d 
index -> 12 : chatacter -> ! 
index -> 13 : chatacter ->   
index -> 14 : chatacter -> H 
index -> 15 : chatacter -> o 
index -> 16 : chatacter -> w 
index -> 17 : chatacter ->   
index -> 18 : chatacter -> a 
index -> 19 : chatacter -> r 
index -> 20 : chatacter -> e 
index -> 21 : chatacter ->   
index -> 22 : chatacter -> y 
index -> 23 : chatacter -> o 
index -> 24 : chatacter -> u 
index -> 25 : chatacter -> ? 

Finding the length of the string

Golang provides built-in functions to find the length of a string. there are two methods that we are using to find the length of the string:

  1. len() method
  2. RuneCountlnString() method

(a) The len() method

The len() method is used to return the number of bytes present in the string.

Syntax:

len(string)

Example 3: Golang program to find the length of string using len() method

package main

import "fmt"

func main() {
	// Creating a string
	myString := "Hello, World!"
	fmt.Printf("The string is %s\n", myString)

	// Printing the length of string
	fmt.Printf("The length of string is %d", len(myString))
}

Output:

The string is Hello, World!
The length of string is 13

(b) The RuneCountlnString() method

The RuneCountlnString() method is used to return the number of runes present in the string. It is a part of the UTF-8 package. Imported as unicode/utf8.

Syntax:

utf8.RuneCountInString(string)

Example 4: Golang program to find the length of string using RuneCountlnString() method

package main

import (
	"fmt"
	"unicode/utf8"
)

func main() {
	// Creating a string
	myString := "Hello, World!"
	fmt.Printf("The string is %s\n", myString)

	// Printing the length of string
	fmt.Printf("The length of string is %d", utf8.RuneCountInString(myString))
}

Output:

The string is Hello, World!
The length of string is 13

Concatenating Strings in Go

We can concatenate string values in Golang to create a new string consisting of both values. To perform this task Golang has a Join() method that can be used to concatenate multiple strings to one using the given separator value. The method accepts two parameters, an array of strings and a separator value. And returns a value that contains the concatenated value.

Syntax:

func Join(strs []string, sep string) string

Example 5: Golang program to concatenate strings

package main

import (
	"fmt"
	"strings"
)

func main() {
	strArr := []string{"Golang", "Programming", "Language"}

	fmt.Println("The concatenated string is", strings.Join(strArr, " "))
}

Output:

The concatenated string is Golang Programming Language

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