This not really true. Put this js console and you'll see that a is the string "[object Object]":
a = {}+[]
{/*do nothing block*/}; +[]I guess JS’s parser explicitly prohibits adding things to a curly-brace enclosed entity?
I’m normally quite defensive of JS, but I’ll have to admit I don’t like that.
You can also do like ({} + []) and it will actually be "adding" them; the confusion solely comes from people typing into the JS console something that wouldn't make any sense to put into an actual script.
({}) + []
-> "[object Object]"
Did you try to do this?
{a: 1} + []
-> 0
{a: 1, b: 2} + []
-> Uncaught SyntaxError: Unexpected token ':'
{
a: while (true)
while (true)
break a;
}