[gear54rus]

It's probably just "'a' + 1 + null , what's the return value?" :D

[sph]

NaNNaNNaN Batman?

https://www.destroyallsoftware.com/talks/wat

[doix]

I mean that one is pretty easy; 'a1null' , first thing is a string so it'll try to concatenate with 1, coerce 1 to a string and get 'a1' then same thing will null. Makes perfect sense ;p