2a09d1a4
 liuqimichale
添加宜春 天水 宣化
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# is-function
[](https://ci.testling.com/grncdr/js-is-function)
Is that thing a function? Use this module to find out.
## API
### module.exports = function isFunction(fn) -> Boolean
Return `true` if `fn` is a function, otherwise `false`.
## Why not typeof fn === 'function'
Because certain old browsers misreport the type of `RegExp` objects as functions.
## Acknowledgements
I stole this from https://github.com/ljharb/object-keys
## License
MIT
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