jashkenas/underscore — pull request #1497 by davidchambers (2014-03-01 23:58:54+00:00)
Title: add _.noop

This is an unassuming function, but I've found myself defining it more often than one might imagine.

An example of a situation in which this function is useful:

```coffeescript
f = (x, success = (->), error = (->)) ->
```

```coffeescript
f = (x, success = _.noop, error = _.noop) ->
```