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Fun with Functions

Instructions

In this assignment, you'll practice creating different types of functions to reinforce the concepts you've learned about JavaScript functions, parameters, default values, and return statements.

Create a JavaScript file called functions-practice.js and implement the following functions:

Part 1: Basic Functions

  1. Create a function called sayHello that doesn't take any parameters and simply logs "Hello!" to the console.

  2. Create a function called introduceYourself that takes a name parameter and logs a message like "Hi, my name is [name]" to the console.

Part 2: Functions with Default Parameters

  1. Create a function called greetPerson that takes two parameters: name (required) and greeting (optional, defaults to "Hello"). The function should log a message like "[greeting], [name]!" to the console.

Part 3: Functions that Return Values

  1. Create a function called addNumbers that takes two parameters (num1 and num2) and returns their sum.

  2. Create a function called createFullName that takes firstName and lastName parameters and returns the full name as a single string.

Part 4: Mix It All Together

  1. Create a function called calculateTip that takes two parameters: billAmount (required) and tipPercentage (optional, defaults to 15). The function should calculate and return the tip amount.

Part 5: Test Your Functions

Add function calls to test each of your functions and display the results using console.log().

Example test calls:

// Test your functions here
sayHello();
introduceYourself("Sarah");
greetPerson("Alex");
greetPerson("Maria", "Hi");

const sum = addNumbers(5, 3);
console.log(`The sum is: ${sum}`);

const fullName = createFullName("John", "Doe");
console.log(`Full name: ${fullName}`);

const tip = calculateTip(50);
console.log(`Tip for $50 bill: $${tip}`);

Rubric

Criteria Exemplary Adequate Needs Improvement
Function Creation All 6 functions are correctly implemented with proper syntax and naming conventions 4-5 functions are correctly implemented with minor syntax issues 3 or fewer functions implemented or major syntax errors
Parameters & Default Values Correctly uses required parameters, optional parameters, and default values as specified Uses parameters correctly but may have issues with default values Incorrect or missing parameter implementation
Return Values Functions that should return values do so correctly, and functions that shouldn't return values only perform actions Most return values are correct with minor issues Significant problems with return statements
Code Quality Clean, well-organized code with meaningful variable names and proper indentation Code works but could be cleaner or better organized Code is difficult to read or poorly structured
Testing All functions are tested with appropriate function calls and results are displayed clearly Most functions are tested adequately Limited or incorrect testing of functions

Bonus Challenges (Optional)

If you want to challenge yourself further:

  1. Create an arrow function version of one of your functions
  2. Create a function that accepts another function as a parameter (like the setTimeout examples from the lesson)
  3. Add input validation to ensure your functions handle invalid inputs gracefully

💡 Tip: Remember to open your browser's developer console (F12) to see the output of your console.log() statements!