30 lines
746 B
JavaScript
30 lines
746 B
JavaScript
var s = Symbol();
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var object = {};
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object[s] = 42;
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assert.equal(42, object[s]);
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// Native Symbol throws for ToString.
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// assert.isUndefined(object[s + '']);
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assertArrayEquals([], Object.getOwnPropertyNames(object));
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assert.isTrue(object.hasOwnProperty(s));
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assert.equal(32, object[s] -= 10);
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assert.equal(16, object[s] /= 2);
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assert.equal(16, object[s]);
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var n = Symbol();
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assert.equal(object[n] = 1, 1);
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assert.equal(object[n] += 2, 3);
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assert.isTrue(Object.getOwnPropertyDescriptor(object, n).enumerable);
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assert.isTrue(n in object);
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assert.isTrue(delete object[n]);
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assert.isFalse(n in object);
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var keys = [];
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for (var k in object) {
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keys.push(k);
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}
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assert.equal(0, keys.length, keys + '');
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assert.equal(0, Object.keys(object).length);
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