--- /dev/null
+/*!
+ * arr-flatten <https://github.com/jonschlinkert/arr-flatten>
+ *
+ * Copyright (c) 2014-2015, Jon Schlinkert.
+ * Licensed under the MIT License.
+ */
+
+'use strict';
+
+module.exports = function flatten(arr) {
+ return flat(arr, []);
+};
+
+function flat(arr, res) {
+ var len = arr.length;
+ var i = -1;
+
+ while (len--) {
+ var cur = arr[++i];
+ if (Array.isArray(cur)) {
+ flat(cur, res);
+ } else {
+ res.push(cur);
+ }
+ }
+ return res;
+}
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