function size(collection) {
	      var length = collection ? getLength(collection) : 0;
	      return isLength(length) ? length : keys(collection).length;
	    }
Gets the size of `collection` by returning its length for array-like
values or the number of own enumerable properties for objects.

@static
@memberOf _
@category Collection
@param {Array|Object|string} collection The collection to inspect.
@returns {number} Returns the size of `collection`.
@example

_.size([1, 2, 3]);
// => 3

_.size({ 'a': 1, 'b': 2 });
// => 2

_.size('pebbles');
// => 7