jQuery.map( { length: 0 } )

[Robert Katić]

IF

{ length: 3, 0: "a", 1: "b", 2: "c" }

is array-like, then there is NO reason why

{ length: 0 }

should not.

Test: ​http://jsfiddle.net/Aa8vc/

[Rick Waldron]

Consider the following:

Array-like objects, such as jQuery collections, are treated as arrays. In other words, if an object has a .length property and a value on the .length - 1 index, it is traversed as an array.

From ​http://api.jquery.com/jquery.map/

Your example does not meet the criteria and therefore is invalid.

[Robert Katić]

Disagree.

"Array-like objects, such as jQuery collections, are treated as arrays. In other words, if an object has a .length property and a value on the .length - 1 index, it is traversed as an array."

So { length: 0, "-1": "a" } is a an array, but { length: 0 } is not?

[Rick Waldron]

disagree all you want, I was simply quoting the docs.

[Robert Katić]

So, ipse dixit. That's your argument? Holy Docs.

[Robert Katić]

Btw. fixing this would also fix #8993, #8995.

[Robert Katić]

A real-world example: ​http://bugs.jquery.com/ticket/9023

[Timmy Willison]

#9025 is a duplicate of this ticket.