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How to check String for equality under Unicode case folding in Golang?

  • Last Updated : 26 Aug, 2019

In Go language, strings are different from other languages like Java, C++, Python, etc. It is a sequence of variable-width characters where each and every character is represented by one or more bytes using UTF-8 Encoding.
In Go strings, you are allowed to compare two strings with each other without any error even if they are written in different cases(lowercase and uppercase) with the help of EqualFold() function. Or in other, this function is used to check whether the specified strings are interpreted as UTF-8 strings and are equal under Unicode case-folding. This function returns true if the given strings are equal under Unicode case-folding or return false if the given strings are not equal under Unicode case-folding. It is defined under the strings package so, you have to import strings package in your program for accessing EqualFold function.

Syntax:

func EqualFold(str1, str2 string) bool

The return type of this function is of the bool type. Let us discuss this concept with the help of the examples:

Example 1:




// Go program to illustrate how to
// check the given strings are equal or not
package main
  
import (
    "fmt"
    "strings"
)
  
// Main function
func main() {
  
    // Creating strings
    // Using var keyword
    var username string
    var uinput string
  
    // Initializing strings
    username = "AnkitaSaini"
    uinput = "ankitasaINI"
  
    // Checking whether the given
    // strings are equal or not
    // Using EqualFold() function
    res := strings.EqualFold(username, uinput)
  
    // Displaying the result according
    // to the given condition
    if res == true {
  
        fmt.Println("!..Successfully Matched..!")
    } else {
  
        fmt.Println("!..Not Matched..!")
    }
  
}

Output:

!..Successfully Matched..!

Example 2:




// Go program to illustrate how to check
// the given strings are equal or not
package main
  
import (
    "fmt"
    "strings"
)
  
// Main function
func main() {
  
    // Creating and initializing strings
    // Using shorthand declaration
    s1 := "I am working as a Technical content writer, in GeeksforGeeks!"
    s2 := "I am currently writing articles on Go language!"
  
    // Checking the given strings are equal or not
    // Using EqualFold() function
    res1 := strings.EqualFold(s1, "I AM WORKING AS A TECHNICAL CONTENT WRITER, IN GEEKSFORGEEKS!")
    res2 := strings.EqualFold(s1, "I AM working AS A Technical CONTENT writer, IN GeeksforGeeks!")
    res3 := strings.EqualFold(s1, "Apple")
    res4 := strings.EqualFold(s2, "I am currently writing articles on Go language!")
    res5 := strings.EqualFold(s2, "I am currently writing ARTICLES on Go language!")
    res6 := strings.EqualFold("GeeksforGeeks", "geeksForgeeks")
  
    // Displaying results
    fmt.Println("Result 1: ", res1)
    fmt.Println("Result 2: ", res2)
    fmt.Println("Result 3: ", res3)
    fmt.Println("Result 4: ", res4)
    fmt.Println("Result 5: ", res5)
    fmt.Println("Result 6: ", res6)
  
}

Output:

Result 1:  true
Result 2:  true
Result 3:  false
Result 4:  true
Result 5:  true
Result 6:  true



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