Introduction to CamelCase

CamelCase is a common practice in programming where each word in a phrase is capitalized except for the first word, and spaces or underscores are removed. For example, `camelCaseExample`.

Understanding CamelCase

CamelCase enhances readability and provides a clean approach to naming variables, methods, and other identifiers in programming.

Key APIs for CamelCase

Here are some essential APIs and code snippets to work with CamelCase:

JavaScript

  
    // Convert string to CamelCase
    function toCamelCase(str) {
        return str.replace(/(?:^\w|[A-Z]|\b\w|\s+)/g, function(match, index) {
            return index === 0 ? match.toLowerCase() : match.toUpperCase();
        }).replace(/\s+/g, '');
    }

    // Example usage
    console.log(toCamelCase('hello world')); // helloWorld
  

Python

  
    # Convert string to CamelCase
    def to_camel_case(snake_str):
        components = snake_str.split('_')
        return components[0] + ''.join(x.title() for x in components[1:])

    # Example usage
    print(to_camel_case('hello_world')) # helloWorld
  

PHP

  
    // Convert string to CamelCase
    function toCamelCase($string) {
        $result = strtolower($string);
        preg_match_all('/_[a-z]/', $result, $matches);
        foreach($matches[0] as $match) {
            $c = str_replace('_', '', strtoupper($match));
            $result = str_replace($match, $c, $result);
        }
        return $result;
    }

    // Example usage
    echo toCamelCase('hello_world'); // helloWorld
  

Ruby

  
    # Convert string to CamelCase
    def to_camel_case(str)
        str.split('_').map.with_index{ |w, i| i == 0 ? w : w.capitalize }.join
    end
    
    # Example usage
    puts to_camel_case('hello_world') # helloWorld
  

Practical Example – ToDo Application

Let’s see a practical example of a ToDo application using CamelCase methods and variable names in JavaScript:

  
    // JavaScript example of a simple ToDo app
    class ToDoApp {
        constructor() {
            this.toDoList = [];
        }

        addToDo(item) {
            this.toDoList.push(item);
        }

        removeToDo(index) {
            this.toDoList.splice(index, 1);
        }

        displayToDos() {
            this.toDoList.forEach((item, index) => {
                console.log(`${index + 1}: ${item}`);
            });
        }
    }

    // Example usage
    const myApp = new ToDoApp();
    myApp.addToDo('Learn JavaScript');
    myApp.addToDo('Learn CamelCase Naming');
    myApp.displayToDos();
  

With these methods and variable names following the CamelCase convention, the code remains clean and concise.

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