3 [![browser support](https://ci.testling.com/grncdr/js-is-function.png)](https://ci.testling.com/grncdr/js-is-function)
5 Is that thing a function? Use this module to find out.
9 ### module.exports = function isFunction(fn) -> Boolean
11 Return `true` if `fn` is a function, otherwise `false`.
13 ## Why not typeof fn === 'function'
15 Because certain old browsers misreport the type of `RegExp` objects as functions.
19 I stole this from https://github.com/ljharb/object-keys