JavaScript comments and whitespace

Here we will outline two handy concepts regarding documentation in JavaScript: comments and whitespace!

Comments

Comments allow us to place notes inside the code, without affecting how the program runs:

// this is a comment in JavaScript

/* 

this is also a comment in JavaScript

when we want to write something 

longer than one line

*/

However, we do hope to write our JavaScript clearly enough so that we can avoid excessive commenting!

Whitespace

To a certain extent, whitespace does not affect the running of JavaScript past the first space, e.g.:

let x = 1

We cannot write the following, for example, and expect the code to behave in the same fashion as the above:

letx=1

JavaScript allows us to do things like:

let x=1

However, for good practice we will just use this sort of spacing:

let x = 1

We could still do more than one space like this

let x     =      1

No matter how we space it, we should choose a convention and stick to it all throughout a script!