What is "undefined x 1" in JavaScript?
arguments, arrays, javascript, oop
Solution
That seems to be Chrome's new way of displaying uninitialized indexes in arrays (and array-like objects):
> Array(100)
[undefined × 100]
Which is certainly better than printing `[undefined, undefined, undefined,...]` or however it was before.
Although, if there is only one `undefined` value, they could drop the `x 1`.
Problem
I'm doing some small experiments based on this blog entry. I am doing this research in Google Chrome's debugger and here comes the hard part. I get the fact that I can't delete local variables (since they are not object attributes). I get that I can 'read out' all of the parameters passed to a function from the array called 'arguments'. I even get it that I can't delete and array's element, only achieve to have `array[0]` have a value of undefined. Can somebody explain to me what `undefined x 1` means on the embedded image? And when I overwrite the function `foo` to return the `arguments[0]`, then I get the usual and 'normal' undefined. This is only an experiment, but seems interresting, does anybody know what `undefined x 1` refers to?