JSTests/test262/test/built-ins/Array/prototype/reduce/15.4.4.21-9-c-ii-10.js

// Copyright (c) 2012 Ecma International.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-array.prototype.reduce
description: >
    Array.prototype.reduce - callbackfn is called with 1 formal
    parameter
---*/

var result = false;

function callbackfn(prevVal) {
  result = (prevVal === 1);
}

[11].reduce(callbackfn, 1);

assert(result, 'result !== true');