Content - 402f1ae6fd5bfea2a18fc70b5ea73c30f6ccd418 - bb3e80e/js/builtins/Object.prototype.hasOwnProperty-prototype-chain.html

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Tip revision: 8f1ef70886a1443ccd9980448031c88a44c3faea authored by Ben Pastene on 13 April 2018, 17:03:33 UTC
Revert "Reland: Use PostTask to schedule cross-process postMessage forwarding."

Tip revision: 8f1ef70

Object.prototype.hasOwnProperty-prototype-chain.html

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<html>
<head>
<meta charset="utf-8">
<title>Object.prototype.hasOwnProperty: Check prototype chain</title>
<link rel="author" title="Masaya Iseki" href="mailto:iseki.m.aa@gmail.com">
<link rel="help" href="https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.prototype.hasownproperty">
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
test(function() {
  [{}, []].forEach(function(that) {
  	that.prop = 'exists';
  	assert_true(that.hasOwnProperty('prop'));
  	assert_true('hasOwnProperty' in that);
  	assert_false(that.hasOwnProperty('hasOwnProperty'));
  });
});

test(function() {
  ['foo', 42].forEach(function(that) {
  	assert_false(that.hasOwnProperty('hasOwnProperty'));
  });
});

test(function() {
  [null, undefined].forEach(function(that) {
    assert_throws(new TypeError(),
        function() { that.hasOwnProperty('hasOwnProperty'); });
  });
});
</script>

</body>
</html>

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