javascript - Objects and arrays addition

Question

Can anyone explain to me how the results of the following was evaluated?

{} + {} // NaN
[] + {} // "[object Object]"
{} + [] // 0
[] + [] // ""

Answer 1

Here is a full explanation of this, check it.

And note {} + {} be NaN if you execute it directly in the console because {} is thought of a block rather than an object.

({}+{}) should be '[object Object][object Object]'

The real result is:

console.log({}+{}) // '[object Object][object Object]'
console.log([]+{}) // '[object Object]'
console.log({}+[]) // '[object Object]'
console.log([]+[]) // ''