As requested, running those rough greps again on the top ten most popular CoffeeScript repos on Github yields:
188 uses of object?.property 32 uses of object?[key] 50 uses of function?(args) 46 uses of variable ?= value ... and the other ones are a bit tricker to grep for. There are at least a handful more uses of the `function?(args)` style but with implicit parentheses: `function? arg1, arg2` ...
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