Why is an empty string false but an empty array is not?

Question

I know the answer to this question is It's in the spec , but what is the logic behind it (if any)?

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> !!''
false
> !![]
true

String, as I understand it, is actually an array with some extra functionality added to make the text easier to work with, but it can still do all the array-like operations, so why is an Empty string falsey but empty array is truthy?

Answer 1

Let’s keep it simple:

!!''

The empty string in JavaScript is treated as a "false" value. When evaluated in a Boolean context, it is treated as Boolean false.

!![]

Arrays, whether or not they contain items, are considered "real" values ​​in Javascript. When evaluated in a Boolean context, they are treated as Boolean true.