Let’s dive right in!
Look through these now and then use them to test yourself after doing the assignment:
The above tutorial mentioned this, but it’s important enough to note again:
var statements. Don’t let it bother you! There’s nothing inherently wrong with
var, and in most cases
let behave the same way. But sometimes the behavior of
var is not what you would expect. Just stick to
const) for now. The precise differences between
let will be explained later.
Numbers are the building blocks of programming logic! In fact, it’s hard to think of any useful programming task that doesn’t involve at least a little basic math… so knowing how numbers work is obviously quite important. Luckily, it’s also fairly straightforward.
Save and open this file up in a web browser and then open up the browser’s console by right-clicking on the blank webpage and selecting “Inspect” or “Inspect Element”. In the ‘Developer Tools’ pane find and select the ‘Console’ tab, where you should see the output of our
console.log()is the command to print something to the developer console in your browser. Use it for all of the following exercises.
Try the following exercises:
console.log(23 + 97)into your html file)
(4 + 6 + 9) / 77
let a = 10
9 * a
let b = 7 * a(returns undefined) and then
maxwith the value
max - 13
actual / max
percentagein the console and press enter you should see a value like
This section contains helpful links to other content. It isn’t required, so consider it supplemental for if you need to dive deeper into something.
This section contains questions for you to check your understanding of this lesson. If you’re having trouble answering the questions below on your own, review the material above to find the answer.
+operator with numbers and strings?