Can somebody help me in demystifying the following expression: ++[[]][+[]]+[+[]] My Understanding Going from left to right: ++[[]] : Not sure what this will evaluate to and how. [+[]] : The +[] will be executed first and the unary operator will try to convert [] to number. Hence 0. So the output of [+[]] will be [0]. [+[]]+[+[]] : Which is equal to [0] + [0]. Here both the array's toString() method will be called and the output will be "00". Basically I am not able to understand the left most expression i.e. ++[[]]

Demistify Coercion in JavaScript

Can somebody help me in demystifying the following expression:

++[[]][+[]]+[+[]]

My Understanding Going from left to right:

++[[]]: Not sure what this will evaluate to and how.
[+[]]: The +[] will be executed first and the unary operator will try to convert [] to number. Hence 0. So the output of [+[]] will be [0].
[+[]]+[+[]]: Which is equal to [0] + [0]. Here both the array's toString() method will be called and the output will be "00".

Basically I am not able to understand the left most expression i.e. ++[[]]