Control Flow Exercises

Boolean Expressions and Truthy Values

1. What is the outcome of the following expressions?

• true || false
• false && false
• true && false
• (false || true) && true
• false && ((true || false) && (false || true))

1. Which of the following are truthy values? (hint: try if("abc"){console.log("I'm truthy!")} in the JS console)

• 1
• 0
• 3.14159
• "abc"
• ""
• Array
• []
• Object
• {}

1. What is the outcome of the following expressions?

• true && 6
• 0 || "hi"
• ["a","b","c"] || "123"
• {"key":"value"} || false

Conditionals!

Remember, you can work in a file (like controlFlow.js) in Sublime Text to keep your code. Run it from the terminal by typing node controlFlow.js, or copy and paste sections into the Chrome developer console.

Jimmy loves roller coasters, but there are a bunch of rules (ugh!) for riding:

For starters, it costs 5 tokens. Here's how we might code that:

var tokens = 3; // Jimmy's tokens

// Can he ride?
if ( tokens >= 5 ) {
    console.log("Step right up!");
} else {
    console.log("Sorry, you can't ride")
}

Edit the code above to check the following additional Requirements:

1. Must be at least 4ft tall.
2. Must be at least 12 years old.
3. Replace the previous rule: now riders under 12 must be accompanied by an adult.
4. If the boss isn't looking, you can sneak in!
5. Riders with a park pass get in free.

Loops!

• Log to the console "This is awesome!" 25 times.
• Create a new variable that is an array of 4 phrases: "Howdy there", "OMG", "javascript", and "Pair Programming".
• Loop over the array and log each phrase to the console.