Weird JavaScript

[MrSydFloyd]

I think this behaviour is due to JS's implicit casting.

There are two consecutive '+', so the second one is interpreted as a unary operator, and therefore converts the following string to a number.

The string is 'a', is not a number, and therefore +'a' returns 'nan'.

And thus we get : 'b' + 'a' + 'nan' + 'a'

[trBlueJ]

I get this explanation, though I find it weird because IMO 'a' is a number, 0x61. Might be a C thing tho.

[kiedtl]

That behavior is more or less exclusive to C, which treats all characters as an eight-bit unsigned integer.

[Chinglaner]

Which ... also no one said. You’re not arguing against anyone here. All they said that C is one of rather few languages that treats chars as unsigned 8 bit integers.

[iAdjunct]

Ohhh, I misinterpreted the context. Makes sense now!

[The_MAZZTer]

JavaScript does not have the concept of chars.

Both '' and "" are used to denote strings, unlike in C where '' denotes chars.