Go Program to Remove Whitespace from a String

Introduction

Removing whitespace from a string involves eliminating all spaces, tabs, and other whitespace characters from the string. This operation is common in data cleaning and text processing. This guide will demonstrate how to write a Go program that removes all whitespace from a given string.

Problem Statement

Create a Go program that:

Prompts the user to enter a string.
Removes all whitespace characters from the string.
Displays the modified string.

Example:

Input: "Hello, World! Welcome to Go."
Output: "Hello,World!WelcometoGo."

Solution Steps

Import the fmt and strings Packages: Use import "fmt" for formatted I/O operations and import "strings" for string manipulation functions.
Write the Main Function: Define the main function, which is the entry point of every Go program.
Input the String: Use fmt.Scanln or fmt.Scanf to take input from the user for the string.
Remove Whitespace: Use the strings.ReplaceAll function to remove all spaces by replacing them with an empty string.
Display the Modified String: Use fmt.Println to display the modified string.

Go Program

package main

import (
    "fmt"
    "strings"
)

/**
 * Go Program to Remove Whitespace from a String
 * Author: https://www.javaguides.net/
 */
func main() {
    // Step 1: Declare a variable to hold the input string
    var input string

    // Step 2: Prompt the user to enter a string
    fmt.Print("Enter a string: ")
    fmt.Scanln(&input)

    // Step 3: Remove all whitespace by replacing spaces with an empty string
    modifiedString := strings.ReplaceAll(input, " ", "")

    // Step 4: Display the modified string
    fmt.Println("String without whitespace:", modifiedString)
}

Explanation

Step 1: Declare Variables

The variable input is declared to store the user’s input string.

Step 2: Input the String

The program prompts the user to enter a string using fmt.Print. The fmt.Scanln function reads the input and stores it in the input variable.

Step 3: Remove Whitespace

The strings.ReplaceAll function is used to replace all occurrences of a space character (" ") with an empty string (""). This effectively removes all spaces from the input string.

Step 4: Display the Modified String

The program prints the modified string, which has no spaces, using fmt.Println.

Output Example

Example 1:

Enter a string: Hello, World! Welcome to Go.
String without whitespace: Hello,World!WelcometoGo.

Example 2:

Enter a string: Go is a powerful language
String without whitespace: Goisapowerfullanguage

Conclusion

This Go program demonstrates how to remove all whitespace from a string using the strings.ReplaceAll function. It covers basic programming concepts such as string manipulation, input/output operations, and handling user input. This example is useful for beginners learning Go programming and understanding how to clean and manipulate strings.