[eropple]

I've never seen `!!!` in JavaScript, and I do a lot of it. Care to share?

[littlecranky67]

Shouldn't have made an example in the if-statement as it is mostly useless there. But triple ! is very common to negate-and-convert a possibly falsy statement (undefined, null, false/true):

const x: boolean | undefined | null = getValue(); const not_x: boolean = !!!y

I added TS type annotation for clarity, although could be inferred if `getValue` is typed accordingly.

[eropple]

I've seen `!!` and I've seen `!`, but what would `!!!` get you here that the other two don't?

[littlecranky67]

negation plus cast to boolean. See this for more info: https://stackoverflow.com/questions/21154510/the-use-of-the-...

[jve]

And line breaks after return statement? Is that true? Haven't stumbled on that one. So this is probably misinformation.

[eropple]

No, that one is true. JS automatic semicolon insertion is dumb.

   return
     <p>
       A JSX paragraph
     </p>

is a common mistake from novices; it'll return void/undefined.

In TypeScript, at least, you get yelled at for this.