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make callback optional in whilst #642

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jordanj77 wants to merge 1 commit into caolan:master from jordanj77:fix_446_whislt_callback

jordanj77 commented Oct 10, 2014

I believe that it's a best practice to make the callback optional.

This technique is used in core node libs (see https://github.com/joyent/node/tree/master/lib) as well as many popular community projects.

Fixes #446


make callback optional in whilst

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