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// |reftest| shell-option(--enable-iterator-helpers) skip-if(!this.hasOwnProperty('Iterator')||!xulRuntime.shell) -- iterator-helpers is not enabled unconditionally, requires shell-options
// Copyright (C) 2023 Michael Ficarra. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-iteratorprototype.reduce
description: >
Iterator.prototype.reduce reducer is passed the yielded value and a counter as arguments
info: |
%Iterator.prototype%.reduce ( reducer )
features: [iterator-helpers]
flags: []
---*/
function* g() {
yield 'a';
yield 'b';
yield 'c';
}
let iter = g();
let assertionCount = 0;
let initialValue = {};
let result = iter.reduce((memo, v, count) => {
switch (v) {
case 'a':
assert.sameValue(memo, initialValue);
assert.sameValue(count, 0);
break;
case 'b':
assert.sameValue(memo, 'a');
assert.sameValue(count, 1);
break;
case 'c':
assert.sameValue(memo, 'b');
assert.sameValue(count, 2);
break;
default:
throw new Error();
}
++assertionCount;
return v;
}, initialValue);
assert.sameValue(result, 'c');
assert.sameValue(assertionCount, 3);
reportCompare(0, 0);
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