README.md

Very Able

Variables allow programmers to store values to be used later in their code. The value that a variable contains can change throughout the runtime of a program.

Before you start this exercise, make sure you have watched the lecture first.

• Lecture

If you get stuck during this exercise, reference this walkthrough. Only watch enough of the walkthrough to get yourself unstuck, then pause the video and pick up the exercise on your own.

• Walkthrough

Ready?

-AZ

0. Do you speak the language?

Create a folder named variables_exercise. Create a file named zero.js inside of it. Predict what the console.logs in the code below will print out:

let location = "Brooklyn, " + "NY";
console.log(location);

let quantity = 4 * 5 + 1;
console.log(quantity);

Test your predictions by typing the code into the zero.js file; don't copy and paste. Run it to check your guess.

1. What's changed? What hasn't?

Create a new file named one.js inside of the variables_exercise folder. Predict what the console.logs in the code below will print out:

let word = "bye";
console.log(word + " felicia");
console.log(word);

let num = 10;
num = num * 2;
console.log(num);

let bottlesOfBeer = 99;
let around = bottlesOfBeer - 1;
console.log(around);
console.log(bottlesOfBeer);

Test your predictions by typing the code into the one.js file. Run it.

2. How about this?

Create a new file named two.js inside of the variables_exercise folder. Predict what the console.logs in the code below will print out:

let apple;
console.log(apple);

apple = 5;
console.log(apple);

apple + 1;
console.log(apple);

apple += 1;
console.log(apple);

let banana = apple;
console.log(banana);

banana = banana / 2;
console.log(banana);

console.log(apple);

Test your predictions by typing the code into the two.js file. Run it.

3. Did you forget about modulo?

Create a new file named three.js inside of the variables_exercise folder. Predict what the console.logs in the code below will print out:

let qty = 15 % 4;
console.log(qty);

let num = 38 + 3;
num++;
console.log(num + " is a great number");

let isNumEven = num % 2 === 0;
console.log(num + " is even? " + isNumEven);

let isQtyEven = qty % 2 === 0;
console.log(qty + " is even? " + isQtyEven);

4. So you can code, but do you have good taste in cinema?

Create a new file named four.js inside of the variables_exercise folder. Create two variables:

• movie, assigned to the string title of your favorite movie
• views, assigned to the number of times you watched that movie

When executed, the program should print the message I watched <movie> about <views> number of times.

Walkthrough