1The Underscore _ Identifier
2A convention has also developed regarding the use of _,
3which is frequently used to preface the name of an object's property
4or method that is private. This is a quick and easy way to immediately
5identify a private class member, and it is so widely used, that almost
6every programmer will recognize it.
1var evens = _.filter([1, 2, 3, 4, 5, 6], function(num){ return num % 2 == 0; });
2=> [2, 4, 6]
3