f897c41092
It turns out "delete" is actually a unary op :) This patch implements deletion of object properties, it doesn't yet work for casually deleting properties from the global object. When deleting a property from an object, we switch that object to having a unique shape, no longer sharing shapes with others. Once an object has a unique shape, it no longer needs to care about shape transitions.
60 lines
1.8 KiB
JavaScript
60 lines
1.8 KiB
JavaScript
load("test-common.js");
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try {
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o = {};
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o.x = 1;
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o.y = 2;
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o.z = 3;
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assert(Object.getOwnPropertyNames(o).length === 3);
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assert(delete o.x === true);
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assert(o.hasOwnProperty('x') === false);
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assert(o.hasOwnProperty('y') === true);
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assert(o.hasOwnProperty('z') === true);
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assert(Object.getOwnPropertyNames(o).length === 2);
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assert(delete o.y === true);
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assert(o.hasOwnProperty('x') === false);
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assert(o.hasOwnProperty('y') === false);
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assert(o.hasOwnProperty('z') === true);
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assert(Object.getOwnPropertyNames(o).length === 1);
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assert(delete o.z === true);
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assert(o.hasOwnProperty('x') === false);
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assert(o.hasOwnProperty('y') === false);
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assert(o.hasOwnProperty('z') === false);
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assert(Object.getOwnPropertyNames(o).length === 0);
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a = [ 3, 5, 7 ];
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assert(Object.getOwnPropertyNames(a).length === 4);
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assert(delete a[0] === true);
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assert(a.hasOwnProperty(0) === false);
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assert(a.hasOwnProperty(1) === true);
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assert(a.hasOwnProperty(2) === true);
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assert(Object.getOwnPropertyNames(a).length === 3);
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assert(delete a[1] === true);
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assert(a.hasOwnProperty(0) === false);
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assert(a.hasOwnProperty(1) === false);
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assert(a.hasOwnProperty(2) === true);
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assert(Object.getOwnPropertyNames(a).length === 2);
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assert(delete a[2] === true);
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assert(a.hasOwnProperty(0) === false);
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assert(a.hasOwnProperty(1) === false);
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assert(a.hasOwnProperty(2) === false);
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assert(Object.getOwnPropertyNames(a).length === 1);
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q = {};
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Object.defineProperty(q, "foo", { value: 1, writable: false, enumerable: false });
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assert(q.foo === 1);
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assert(delete q.foo === false);
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assert(q.hasOwnProperty('foo') === true);
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console.log("PASS");
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} catch (e) {
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console.log("FAIL: " + e);
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}
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