How to replace all occurrences of a character in string?

How to Replace All Occurrences of a Character in a String

Replacing all occurrences of a character in a string is a common operation in many programming languages. Here’s how you can achieve this in a variety of languages, including Python, Java, JavaScript, and C++.

Python

In Python, you can use the built-in str.replace() method to replace all occurrences of a character in a string.

# Using str.replace() method
original_string = "hello world"
modified_string = original_string.replace('l', 'x')
print(modified_string)  # Output: hexxo worxd

Java

In Java, you can use the String.replace() method, which replaces all occurrences of a specified character with another character.

public class Main {
    public static void main(String[] args) {
        String originalString = "hello world";
        String modifiedString = originalString.replace('l', 'x');
        System.out.println(modifiedString);  // Output: hexxo worxd
    }
}

JavaScript

In JavaScript, you can use the String.prototype.replace() method along with a global regular expression to replace all occurrences of a character.

// Using String.prototype.replace() with a global regular expression
let originalString = "hello world";
let modifiedString = originalString.replace(/l/g, 'x');
console.log(modifiedString);  // Output: hexxo worxd

C++

In C++, you can replace characters in a string using the std::replace algorithm from the <algorithm> library.

#include <iostream>
#include <string>
#include <algorithm>

int main() {
    std::string originalString = "hello world";
    std::replace(originalString.begin(), originalString.end(), 'l', 'x');
    std::cout << originalString << std::endl;  // Output: hexxo worxd
    return 0;
}

Summary

• Python: Use str.replace('old_char', 'new_char').
• Java: Use String.replace('old_char', 'new_char').
• JavaScript: Use String.prototype.replace(/old_char/g, 'new_char').
• C++: Use std::replace from the <algorithm> library.

Each method is idiomatic to the language it is used in and provides an efficient way to replace characters in a string. For more in-depth knowledge and practical examples on programming concepts, consider exploring Grokking the Coding Interview on DesignGurus.io, which provides comprehensive courses on essential coding and interview techniques.