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diff --git a/lib/reduceright/index.js b/lib/reduceright/index.js
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+++ b/lib/reduceright/index.js
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+'use strict';
+
+var map = require('async.util.map');
+var reduce = require('async.reduce');
+var identity = require('async.util.identity');
+
+module.exports = function reduceRight (arr, memo, iterator, cb) {
+    var reversed = map(arr, identity).reverse();
+    reduce(reversed, memo, iterator, cb);
+};