Bump to v3.0.0.

collection/size.js

@@ -0,0 +1,29 @@
+import isLength from '../internal/isLength';
+import keys from '../object/keys';
+
+/**
+ * Gets the size of `collection` by returning `collection.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]);
+ * // => 2
+ *
+ * _.size({ 'one': 1, 'two': 2, 'three': 3 });
+ * // => 3
+ *
+ * _.size('pebbles');
+ * // => 7
+ */
+function size(collection) {
+  var length = collection ? collection.length : 0;
+  return isLength(length) ? length : keys(collection).length;
+}
+
+export default size;