Different ways to compare Strings in Golang

In Go language, the string is an immutable chain of arbitrary bytes encoded with UTF-8 encoding. You are allowed to compare strings with each other using two different ways:

1. Using comparison operators: Go string supprot comparasion coperators, i.e, ==, !=, >=, <=, <, >. Here, == and != operator is used to check if the given strings are equal or not. and >=, <=, <, > opeartors are used to find the lexical order. The result of these opertors are of Boolean type, means if the condition satisfy it will return true, otherwise, return false.

Example 1:



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// Go program to illustrate the concept
// of == and != operator with strings
package main
  
import "fmt"
  
// Main function
func main() {
  
    // Creating and initializing strings
    // using shorthand declaration
    str1 := "Geeks"
    str2 := "Geek"
    str3 := "GeeksforGeeks"
    str4 := "Geeks"
  
    // Checking the string are equal
    // or not using == operator
    result1 := str1 == str2
    result2 := str2 == str3
    result3 := str3 == str4
    result4 := str1 == str4
      
    fmt.Println("Result 1: ", result1)
    fmt.Println("Result 2: ", result2)
    fmt.Println("Result 3: ", result3)
    fmt.Println("Result 4: ", result4)
  
    // Checking the string are not equal
    // using != operator
    result5 := str1 != str2
    result6 := str2 != str3
    result7 := str3 != str4
    result8 := str1 != str4
      
    fmt.Println("\nResult 5: ", result5)
    fmt.Println("Result 6: ", result6)
    fmt.Println("Result 7: ", result7)
    fmt.Println("Result 8: ", result8)
  
}

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Output:

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

Result 5:  true
Result 6:  true
Result 7:  true
Result 8:  false

Example 2:

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// Go program to illustrate the concept
// of comparison operator with strings
package main
  
import "fmt"
  
// Main function
func main() {
  
    // Creating and initializing
    // slice of string using the
    // shorthand declaration
    myslice := []string{"Geeks", "Geeks",
                    "gfg", "GFG", "for"}
      
    fmt.Println("Slice: ", myslice)
  
    // Using comparison operator
    result1 := "GFG" > "Geeks"
    fmt.Println("Result 1: ", result1)
  
    result2 := "GFG" < "Geeks"
    fmt.Println("Result 2: ", result2)
  
    result3 := "Geeks" >= "for"
    fmt.Println("Result 3: ", result3)
  
    result4 := "Geeks" <= "for"
    fmt.Println("Result 4: ", result4)
  
    result5 := "Geeks" == "Geeks"
    fmt.Println("Result 5: ", result5)
  
    result6 := "Geeks" != "for"
    fmt.Println("Result 6: ", result6)
  
}

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Output:

Slice:  [Geeks Geeks gfg GFG for]
Result 1:  false
Result 2:  true
Result 3:  false
Result 4:  true
Result 5:  true
Result 6:  true

2. Using Compare() method: You can also compare two string using inbuilt function Compare() provide by the string package. This function return integer value after comparing two strings lexicographically. The return values are:

  • Return 0, if str1 == str2.
  • Return 1, if str1 > str2.
  • Return -1, if str1 < str2.

Syntax:

func Compare(str1, str2 string) int

Example:

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// Go program to illustrate how to compare
// string using compare() function
package main
  
import (
    "fmt"
    "strings"
)
  
func main() {
  
    // Comparing string using Compare function
    fmt.Println(strings.Compare("gfg", "Geeks"))
      
    fmt.Println(strings.Compare("GeeksforGeeks"
                               "GeeksforGeeks"))
      
    fmt.Println(strings.Compare("Geeks", " GFG"))
      
    fmt.Println(strings.Compare("GeeKS", "GeeKs"))
  
}

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Output:

1
0
1
-1


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