Why use typeof for identifying a function?

Question

Are there any significant reasons for using

typeof variable === \'function\'

versus

!!variable.call

for d

Answer 1

A regular expression is a function

/bar/("bar") === ["bar"]

So typeof /bar/ === "function"

Although only chrome recognises that a regexp literal can be used as a function. Whether this should be so or not is up for grabs. You can treat it just like a function!