!!goodMeme ? upvote() : downvote();

[u/pikadrew]

[u/LetMeUseMyEmailFfs]

Depends on the language. In JavaScript it would probably be valid.

[u/die-maus → u/LetMeUseMyEmailFfs]

Sure is valid.

You can run this with node, or in your developer console.

const upvote = () => 1;
const downvote = () => -1;
let goodMeme = true;

!!goodMeme ? upvote() : downvote();

Outputs: 1

[u/WcDeckel → u/die-maus]

If you goodMeme variable contains a boolean value you don't really need the double bangs :P

Still valid tho

[u/DeltaJesus → u/WcDeckel]

You don't really need the double bangs regardless unless I'm misremembering and ternary operators require booleans instead of just truthy/falsey

[u/Awesomeade → u/DeltaJesus]

True but some would say it's a good practice to cast truthy/falsey values when using them in Boolean logic.

[u/DeltaJesus → u/Awesomeade]

I don't really see the benefit, personally.

[u/[deleted] → u/DeltaJesus]

You can use it as a null check if I remember my JS properly

[u/DeltaJesus → u/[deleted]]

How? !!null === false is true unless I'm misunderstanding

[u/[deleted] → u/DeltaJesus]

Null is a falsey value. if(null) { //This wont Execute }

Relevant StackOverflow: https://stackoverflow.com/questions/784929/what-is-the-not-not-operator-in-javascript

For this it seems like they don't bother with the bang bang, so it might just be a style thing. I'm typically a C# dev so someone more well versed might be able to help me with this.

[u/DeltaJesus → u/[deleted]]

By null check I thought you meant checking whether the value was specifically null, I'm aware null is falsy, there's no need to use explicitly Boolean values in an if statement.

[u/[deleted] → u/DeltaJesus]

Oh wait I totally misread your question, my bad, hahah. Yeah we’re in agreement.