property-accessor.js

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/* Any copyright is dedicated to the Public Domain.

 * http://creativecommons.org/licenses/publicdomain/ */

var obj = {};

var sym = Symbol();

var gets = 0;

var sets = [];

Object.defineProperty(obj, sym, {

    get: function () { return ++gets; },

    set: function (v) { sets.push(v); }

});

// getter

for (var i = 1; i < 9; i++)

    assertEq(obj[sym], i);

// setter

var expected = [];

for (var i = 0; i < 9; i++) {

    assertEq(obj[sym] = i, i);

    expected.push(i);

assertDeepEq(sets, expected);

// increment operator

gets = 0;

sets = [];

assertEq(obj[sym]++, 1);

assertDeepEq(sets, [2]);

// assignment

gets = 0;

sets = [];

assertEq(obj[sym] *= 12, 12);

assertDeepEq(sets, [12]);

if (typeof reportCompare === "function")

    reportCompare(0, 0);