Practice What You Learned

Introduction

This lab provides an opportunity to practice defining and coding some real-world functions

Note: Feel free to work in pairs to complete this lab. Also, Google/StackOverflow is a good friend to have around...

Exercise

Setup & Instructions

For the exercises in this lab, create a JavaScript REPL from repl.it -- you can name it "JavaScript Functions lab".

As a reminder this lab is is a deliverable.

This was assigned previously and this is on purpose.

Requirements

Define and code all the functions below this time and Incorporate what you learned about Big O.

Define the functions using the approach as specified (either as a function expression or declaration).

Be sure to number each function with a comment above it.

After each function, call it at least once and console.log the results.

For example, here's the first function, our gift to you:

// 1.
function maxOfTwoNumbers(x, y) {
  if (x >= y) {
    return x;
  } else {
    return y;
  }

  // or more "elegantly" using the fantastic ternary expression!
  // return  x >= y ? x : y;
}

console.log(maxOfTwoNumbers(3, 9));

// 2.
...

Here are the functions:

1. (completed above) Define a function, as a function declaration, maxOfTwoNumbers that takes two numbers as arguments and returns the largest of them. If they are the same, return that number. Use the if-else construct or a ternary expression - the Math.max method is not allowed.
2. Define a function, as a function expression, maxOfThree that takes three numbers as arguments and returns the largest of them. Again, the Math.max method is not allowed.
3. Define a function, as a function declaration, isCharAVowel that takes a character as an argument and returns true if it is a vowel, false otherwise.
4. Define a function, as a function expression, sumArray that takes an array of numbers and returns the sum of those numbers. For example, sumArray([2, 4, 5]); would return 11.
5. Define a function, as a function declaration, multiplyArray that takes an array of numbers and returns the product those numbers. For example, multiplyArray([2, 4, 5]); would return 40.
6. Define a function, as a function expression, numArgs that returns the number of arguments passed to the function when called.
7. Define a function, as a function declaration, reverseString that takes a string, reverses the characters, and returns it. For example, reverseString('rockstar'); would return the string "ratskcor".
8. Define a function, as a function expression, longestStringInArray that takes an array of strings as an argument and returns the length of the longest string.
9. Define a function, as a function declaration, stringsLongerThan that takes an array of strings and a number as arguments; and returns an array of the strings that are longer than the number passed in. For example, stringsLongerThan(['say', 'hello', 'in', 'the', 'morning'], 3); would return ["hello", "morning"].

Additional Resources

MDN Functions