> Even if you're a JS developer, most of this syntax is probably, and hopefully, not something you use in your daily life.
So I think you should look at this site more as something fun you might not have known if you're an js developer than as criticism of js.
That being said, the !!"" isn't that weird of a syntax is it? I see and use the double exclamation mark all the time.
Most people arent going to "know" what '+!![]' will resolve to because it makes literally no sense to combine those operators into a single expression in anything approaching normal code.
The fact that [] is truthy is something everybody learns in their first weeks of JS programming otherwise you would be writing `if (someArray)` and wondering why your code is broken.
A weird one would be to explain why +[] is 0 and +{} is NaN. That is nonsensical.
> the !!"" isn't that weird of a syntax is it?
Why would someone say not not empty string in code somewhere? Or do you mean seeing !!var_that_could_have_empty_string isn't too weird?
perl -e 'print !!"whee"'
1
php -r 'print !!"whee";'
1
awk 'BEGIN {print !!"whee"}'
1