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Chris Tate
c257368c5e
* Compile Effect generators statically * test: declare the dormant array write's expected fence
54 lines
2.3 KiB
JavaScript
54 lines
2.3 KiB
JavaScript
const key = Symbol.for("property");
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const different = Symbol("property");
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const method = Symbol.for("method");
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const base = {
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title: "base",
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[key]: 1,
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[different]: 2,
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[method]() { return this.title; },
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};
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console.log(base[key], base[different], base[Symbol("property")]);
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base[key] = 3;
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console.log(base[key], base[method]());
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const child = Object.create(base);
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child.title = "child";
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console.log(child[key], child[method]());
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child[key] = 4;
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console.log(child[key], base[key]);
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console.log(Object.keys(base).join(","), JSON.stringify(base));
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const accessor = Symbol("accessor");
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Object.defineProperty(base, accessor, {
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get() { return this.title; },
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set(value) { this.title = value; },
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configurable: true,
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});
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console.log(child[accessor]);
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child[accessor] = "changed";
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console.log(child.title, base.title);
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console.log(key in child, different in child, Symbol("missing") in child);
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console.log(child.hasOwnProperty(key), child.hasOwnProperty(different));
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console.log(base.propertyIsEnumerable(key), base.propertyIsEnumerable(accessor));
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const descriptor = Object.getOwnPropertyDescriptor(base, key);
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console.log(descriptor.value, descriptor.writable, descriptor.enumerable, descriptor.configurable);
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const copied = { ...base };
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console.log(copied[key], copied[different], copied[method]());
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const assigned = Object.assign({}, base);
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console.log(assigned[key], assigned[different]);
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function remove(object, property) { delete object[property]; }
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remove(child, key);
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console.log(child[key], child.hasOwnProperty(key));
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remove(base, different);
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console.log(different in base);
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const iterator = Symbol.iterator;
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console.log(iterator === Symbol.iterator, iterator === Symbol.for("Symbol.iterator"));
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console.log(iterator.description, Symbol.keyFor(iterator));
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console.log(Object.getOwnPropertySymbols(base).map(symbol => symbol.description).join(","));
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console.log(Object.getOwnPropertyDescriptors(base)[key].value, Object.hasOwn(base, key));
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Object.freeze(base);
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console.log(Object.isFrozen(base), Object.isSealed(base));
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try { base[key] = 9; } catch (error) { console.log(error.name); }
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console.log(base[key]);
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const fromEntries = Object.fromEntries;
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const rebuilt = fromEntries([[key, "symbol"], ["plain", "string"]]);
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console.log(rebuilt[key], rebuilt.plain, fromEntries === Object.fromEntries);
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