JavaScript Weirdness

I was just listening to the lightning talk by Gary Bernhardt from CodeMash 2012 and he brought up some really interesting (and funny) points about JavaScript.

For example:

[] + [];

””

{} + {};

NaN

[] + {};

[object Object]

{} + [];

0

So why is it that if you add two empty Arrays you get an empty string, but if you add two objects you get “not a number”. Array + Object is an Object but Object plus Array is 0???

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