practice.js

// 1. What happens when you print out the value of a variable that you have
// declared but you didn't define?

console.log("Svaret på spørgsmål 1:")

// 2. Identifiers have some pretty specific rules in JavaScript. Experiment with
// declaring variables using various symbols other than letters and numbers and see
// when you get a Syntax Error.

console.log("Svaret på spørgsmål 2:")

// 3. Declare and define a variable that stores your name. Using that variable,
// construct a new variable that represents a greeting by concatentating "Hello" in
// front of your name. For example, we'd want to store the value "Hello Semmy" in a
// variable, where "Semmy" is stored in another variable.

console.log("3 ");

// 4. Using just the name variable from the previous question, create a more
// complex greeting that looks like "Hello, Semmy!" and store that in a variable.

console.log("4 ");

// 5. Create a variable that represents a worker's hourly wage. Create another
// variable that represents the number of hours a worker has worked. Store values
// in both of those variables, and create a variable that stores the total wage
// based on the number of hours worked and the hourly wage.

console.log(5);

// 6. We've seen that variables can store strings and numbers. We've also seen that
// when we have two strings the `+` operator means _concatenation_, whereas when we
// have two number variables it represents _addition_. What happens when we mix and
// match number and string variables? Give it a try and do your best to explain
// what you see.

console.log("opgave 6")

// 7. In the last example, we ended up with a long decimal number. We'd
// like to round it off, but we don't know how to do that. The _Mozilla
// Developer Network_ has excellent JavaScript documentation, and there
// is a special _function_ called `Math.round` that will help us do
// that. It would be worthwhile for you to read the documentation on this
// function [here](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/round).
// If you're feeling very brave, give it a try! You can round dollar amounts to two
// decimal places by first multiplying by 100, then rounding the nearest integer,
// then dividing by 100. You can divide by using the `/` operator.

console.log("opgave 7")

// 8. You may have seen HTML in the past, but in case you haven't, a paragraph tag
// in HTML looks like this:

//         <p>This is a paragraph!</p>

console.log("opgave 8")

//     The first tag, `<p>` is an opening tag, and the last tag, `</p>` is a closing
// tag. Create a variable that stores the value "This is a paragraph!" and then use
// it to construct a new value that represents this snippet of HTML by
// concatenating an opening `<p>` tag to the front, and a closing `</p>` tag to the
// back.

// 9. Consider the following sequence of variable assignments.

console.log("opgave 9")


//         var tweet = "hello world!";
//         var count = 0;

//         count = count + 10;
//         tweet = tweet + count;

//         // what is the value of tweet and count now?

//         count = count * 10;
//         tweet = count + tweet;

//         // what is the value of tweet and count now?

//         count = count * 100;
//         tweet = tweet + ". this is another sentence.";

//         // what is the value of tweet and count now?