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JavaScript Functions

Getting Started

  1. Open your command line and navigate to your repos directory (if you do not have a repos folder, then you can use mkdir repos to create one)
  2. Use this template repository to start a new project in your repos folder: git clone <repo_name>
  3. cd repo_name to navigate into your new repo directory
  4. Start Visual Studio Code and select 'Open Folder'. Then select repo_name to open the folder in the editor (or just type code . in your terminal inside the repo directory)
  5. Follow the instructions on the README.md file to complete exercises
  6. Open the app.js file to get started

Exercise 1: Minimum Number

  • In the past, we created a selection statement inside a loop that counted from 1 to 100, and only printed out the odd numbers.
  • Your task is to write a function printOdds() that takes one parameter, count, and uses a loop and selection statement to count to the number passed in, printing out the odd numbers.
  1. Declare a function named printOdds using declaration notation (function <name>(){...})
  2. The function should take in one parameter named count
  3. The function body should:
    • contain a for loop that counts to the parameter passed in,
    • an if/else statement that determines if the current value is odd,
    • and then console.log() the odd value to the console
  4. BONUS: Now that you do not know exactly what number may be passed in as count, use an if statement to account for a negative count being passed in.

Exercise 2: Legal?

  • Write a function that receives a name and age, and prints a greeting message to the console using the name.
  1. Declare a function named checkAge using declaration notation (function <name>(){...})
  2. The function should take in one parameter named age
  3. The function body should:
    • declare and initialize an aboveSixteen local variable with string value: "You can drive!",
    • declare and initialize an belowSixteen local variable with string value: "Sorry, but you need to wait until you're 16.",
    • an if/else statement that determines if the age value is below 16,
    • and then console.log() the correct message to the console.
  4. BONUS: Remember that paramaters are optional, and no name or age value could be passed in. Correctly account for no parameter being passed in.

More Practice

  • Assign a function to a variable
  • Pass a function as a parameter(argument)
  • Return a function from a function