strings.TrimFunc() Function in Golang With Examples

strings.TrimFunc() Function in Golang is used to returns a slice of the string s with all leading and trailing Unicode code points c satisfying f(c) removed.

Syntax:

func TrimFunc(s string, f func(rune) bool) string

Here, s is the string and function checks the value of rune and returns true if it can be trimmed.

Return Type: It returns the string after removing the specified characters from string.

Example 1:

// Golang program to illustrate 
// the strings.TrimFunc() Function 
package main 
  
// importing fmt, unicode and strings 
import ( 
    "fmt"
    "strings"
    "unicode"
) 
  
// Calling Main method 
func main() { 
  
    // Here we have a string. The function 
    // returns true for the letters 
    // and all other will trim out 
    // from the string 
    fmt.Print(strings.TrimFunc("77GeeksForGeeks!!!", func(r rune) bool { 
        return !unicode.IsLetter(r) 
    })) 
} 

Output:

GeeksForGeeks

Example 2:

// Golang program to illustrate 
// the strings.TrimFunc() Function 
  
package main 
  
// importing fmt, unicode and strings 
import ( 
    "fmt"
    "strings"
    "unicode"
) 
  
// Calling Main method 
func main() { 
  
    // Here we have a string. The function 
    // returns true for the letters 
    // and numbers as well 
    // and all other will trim out 
    // from the string 
    fmt.Print(strings.TrimFunc("1234GeeksForGeeks!!!!", func(r rune) bool { 
        return !unicode.IsLetter(r) && !unicode.IsNumber(r) 
    })) 
} 

Output:

1234GeeksForGeeks

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