Javascript new Array and join() method

Question

Inspired by this popular speech I wanted to figure out some issue related to creating arrays. Let\'s say I am creating new array with:

Array(3)

Answer 1

If you have an Array of 3 members, the .join is the filler in between the members, so there should only be two join strings.

Therefore your second output is correct.

Your first output using .join(), seems like a display bug or a misrepresentation of your testing code.

The default value for .join() is a ",", so this:

new Array(3).join();

should give you this:

",,"

The output that you show:

[, ,]

will more likely come from just typing new Array(3) in the console without the .join().