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After reading this SE Discussion a question pops up. Why jquery defined two methods for the same purpose? Is there any purpose I missed?

Don't know this belongs to a wiki discussion. If so please guide me to change this so.

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I would guess someone just didn't think it through, unless perhaps the earliest versions had some reason. I could only find source back to 1.2.6, and it is unchanged from the current version.

EDIT: It seems to have been unchanged since version 1.0.1.

The documentation for .size() suggests that it should not be used.

You should use the .length property instead, which is slightly faster.

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Thanks for your efforts. If we think it is confusing, should we raise bug/correction request in jquery official forum/bug tracking system? Or need more research?
@rajakvk - The best you could probably hope for would be some additional clarification in the documentation. I would doubt it will be removed from the API at this point, though. If I as to guess, I'd say that the request would be marked as "invalid" or perhaps "low priority" at best. Couldn't hurt to try though. :o)
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length is a property inherit from javascript

size() is a method

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size returns length. Length is a bit faster.

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Length is faster because its a core javascript method , isn't it?
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"most likely implemented to abstract away from the possibility of the length property being changed"

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oh... Is there any proposal to change length property in near future?
don't know ... I'm quoting someone else's answer as it seems the most reasonable explanation of the design decision

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