How to use the strconv.UnquoteChar() function in Golang

The strconv.UnquoteChar() function

The strconv package’s UnquoteChar() function decodes the first character or byte in an escaped string or character literal represented by the string s.

Syntax

func UnquoteChar(s string, quote byte) (value rune, multibyte bool, tail string, err error)

Parameters

  • s: This represents the quoted string.
  • quote: This is the byte value that has to be checked.

Return value

The UnquoteChar() function returns four values:

  • value: This is a decoded Unicode point value of the rune type (i.e., the quote character).
  • multibyte: This is a Boolean value that specifies whether a multibyte UTF-8 representation is required for the decoded character.
  • tail: This is a string that follows the initial quote character and is the last string.
  • error: This is returned when the character is not syntactically valid. If the character is syntactically valid, then the error will be <nil>.

Code

The following code shows how to use the UnquoteChar() function in Golang.

// using strconv.UnquoteChar() Function in Golang
package main
import (
	"fmt"
	"strconv"
)
func main() {
	// declare variable s and assign value to it
	var s = "`Golang is one of my favourite programming languages`"
	// declare variable value, mb, tail, err and assign value to it
	// represent the return values
	value, mb, tail, err := strconv.UnquoteChar(s, '`')
	// Checks if the character is syntactically valid
	if err != nil {
		fmt.Println("Error:", err)
	}
	// display result
	fmt.Println("value:", string(value))
	fmt.Println("multibyte:", mb)
	fmt.Println("tail:", tail)
	fmt.Println()
	
	// reassigning value
	s = `\"Educative shot on UnqouteChar() function\"`
	// display result
	fmt.Println(strconv.UnquoteChar(s, '"'))
}

Explanation

  • Line 4: We add the main package.
  • Lines 6–9: We import the necessary packages for the Golang project.
  • Lines 11–33: We define the main() function.
  • Line 13: We define the variable s of the string type and assign a value to it.
  • Line 17: We define variables value, mb, tail, and err. These variables represent the return values. Next, we pass the variable s in the UnquoteChar() function and assign it to variables value, mb, tail, and err.
  • Line 17: We use the if statement to check if the character is syntactically valid. If the condition is satisfied, the error will be displayed.
  • Line 24: We display the result for value.
  • Line 25: We display the result for mb.
  • Line 26: We display the result for tail.
  • Line 30: We assign another value to variable s.
  • Line 32: We pass the variable s in the UnquoteChar() function and display the result.

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