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+var getLength = require('../internal/getLength'),
+ isLength = require('../internal/isLength'),
+ keys = require('../object/keys');
+
+/**
+ * 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
+ */
+function size(collection) {
+ var length = collection ? getLength(collection) : 0;
+ return isLength(length) ? length : keys(collection).length;
+}
+
+module.exports = size;