Golang strings.TrimSuffix Function

The strings.TrimSuffix function in Golang is part of the strings package and is used to remove a specified suffix from a string. If the string ends with the specified suffix, the function returns the string without that suffix. If the string does not end with the suffix, the original string is returned unchanged. This function is particularly useful for processing strings with known suffixes, such as file extensions, URL parameters, or other standardized endings.

Table of Contents

1. Introduction
2. TrimSuffix Function Syntax
3. Examples
   • Basic Usage
   • Removing File Extensions
4. Real-World Use Case
5. Conclusion

Introduction

The strings.TrimSuffix function provides a simple utility for removing a specified suffix from a string. It is often used when handling strings that have consistent ending sequences that need to be removed before further processing.

TrimSuffix Function Syntax

The syntax for the strings.TrimSuffix function is as follows:

func TrimSuffix(s, suffix string) string

Parameters:

• s: The input string from which the suffix should be removed.
• suffix: The suffix string that needs to be removed from the input string.

Returns:

• The string with the suffix removed if it exists; otherwise, the original string.

Examples

Basic Usage

This example demonstrates how to use the strings.TrimSuffix function to remove a suffix from a string.

Example

package main

import (
	"fmt"
	"strings"
)

func main() {
	// Define a string with a suffix
	text := "example.txt"

	// Define the suffix to be removed
	suffix := ".txt"

	// Use strings.TrimSuffix to remove the suffix from the string
	trimmedText := strings.TrimSuffix(text, suffix)

	// Print the result
	fmt.Println("Trimmed String:")
	fmt.Println(trimmedText)
}

Output:

Trimmed String:
example

Removing File Extensions

You can use strings.TrimSuffix to remove file extensions from filenames, which is useful for file processing tasks.

Example

package main

import (
	"fmt"
	"strings"
)

func main() {
	// Define a filename with an extension
	filename := "document.pdf"

	// Define the suffix to be removed
	suffix := ".pdf"

	// Use strings.TrimSuffix to remove the file extension
	trimmedFilename := strings.TrimSuffix(filename, suffix)

	// Print the result
	fmt.Println("Trimmed Filename:")
	fmt.Println(trimmedFilename)
}

Output:

Trimmed Filename:
document

Removing URL Parameters

You can also use strings.TrimSuffix to remove URL parameters or fragments from a URL.

Example

package main

import (
	"fmt"
	"strings"
)

func main() {
	// Define a URL with a fragment
	url := "https://example.com/page#section"

	// Define the suffix to be removed
	suffix := "#section"

	// Use strings.TrimSuffix to remove the fragment
	trimmedURL := strings.TrimSuffix(url, suffix)

	// Print the result
	fmt.Println("Trimmed URL:")
	fmt.Println(trimmedURL)
}

Output:

Trimmed URL:
https://example.com/page

Real-World Use Case

Processing Configuration Keys

In real-world applications, strings.TrimSuffix can be used to process configuration keys by removing known suffixes to extract relevant data.

Example

package main

import (
	"fmt"
	"strings"
)

func main() {
	// Define a configuration key
	configKey := "database.url.active"

	// Define the suffix to be removed
	suffix := ".active"

	// Use strings.TrimSuffix to remove the suffix from the configuration key
	trimmedKey := strings.TrimSuffix(configKey, suffix)

	// Print the result
	fmt.Println("Processed Configuration Key:")
	fmt.Println(trimmedKey)
}

Output:

Processed Configuration Key:
database.url

Conclusion

The strings.TrimSuffix function in Go is a straightforward utility for removing specified suffixes from strings. It is especially useful for processing strings with known ending sequences, such as file extensions or URL fragments. By using strings.TrimSuffix, you can efficiently manage and process text data in your Go applications, ensuring that strings are prepared for further analysis or use.