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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?
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A variable that has not been assigned a value is of type undefined . A method or statement also returns undefined if the variable that is being evaluated does not have an assigned value. A function returns undefined if a value was not returned .
undefined is not being converted to anything. You perform a + operation with operands 1 (Number) and undefined . The result of Number + undefined is not a number or NaN .
It's exactly the same. From your question, it seems a little bit like you're specifically looking for number elements, even NaN .
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.
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