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+var baseKeys = require('./_baseKeys'),
+ getTag = require('./_getTag'),
+ isArrayLike = require('./isArrayLike'),
+ isString = require('./isString'),
+ stringSize = require('./_stringSize');
+
+/** `Object#toString` result references. */
+var mapTag = '[object Map]',
+ setTag = '[object Set]';
+
+/**
+ * Gets the size of `collection` by returning its length for array-like
+ * values or the number of own enumerable string keyed properties for objects.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to inspect.
+ * @returns {number} Returns the collection size.
+ * @example
+ *
+ * _.size([1, 2, 3]);
+ * // => 3
+ *
+ * _.size({ 'a': 1, 'b': 2 });
+ * // => 2
+ *
+ * _.size('pebbles');
+ * // => 7
+ */
+function size(collection) {
+ if (collection == null) {
+ return 0;
+ }
+ if (isArrayLike(collection)) {
+ return isString(collection) ? stringSize(collection) : collection.length;
+ }
+ var tag = getTag(collection);
+ if (tag == mapTag || tag == setTag) {
+ return collection.size;
+ }
+ return baseKeys(collection).length;
+}
+
+module.exports = size;