WTF does this code do?(benvan.co.uk)

benvan.co.uk

http://benvan.co.uk/wtf/happy.html

6 comments

sigvef12 lat temu

This is why you should always use semicolons in JavaScript. Omitting semicolons here turns this:

  var angry = say('Garrrr!')
  
  // what should I say?
  (amIHappy ? happy : angry)()

into this:

  var angry = say('Garrrr!')(amIHappy ? happy : angry)()

zequel12 lat temu

Most web browsers (if you're running this code in a web browser), will do ASI (automatic semicolon insertion).

http://jsfiddle.net/CxUXh/ works fine in Chrome, changing the console.log to an alert.

Not that I'm advocating omitting semicolons!

benvan12 lat temu

Interesting - your jsfiddle exhibits broken behaviour (alerting 'garrr') on my browser - chrome 33.0.1750.152. I believe I'm fairly up to date.

zequel12 lat temu

You're correct, I thought that was expected behavior, my mistake. TBH though, I'm surprised ASI didn't fix the problem, I'll have to look at the rules for insertion again.

dsschnau12 lat temu

Does it return that because `say` isn't defined inside its own function definition, so it evaluates as false?

TophWells12 lat temu

It doesn't seem to do anything.

rainmaking12 lat temu

Hahaha, nice!

I'm getting a linter.

dismal212 lat temu

this is idiotic