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25 lines
895 B
JavaScript
25 lines
895 B
JavaScript
function observe(values) {
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console.log([...values.keys()].join(","));
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console.log(JSON.stringify([...values.entries()]));
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console.log([...values.values()].join(","));
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const iterator = values.entries();
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console.log(iterator.next().value.join(":"));
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values.push(9);
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console.log(JSON.stringify([...iterator]));
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console.log(iterator.next().done);
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values.push(10);
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console.log(iterator.next().done);
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}
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const sparse = new Array(3);
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sparse[0] = 1;
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sparse[2] = 3;
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observe(sparse);
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const inherited = new Array(2);
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const prototype = Object.create(Array.prototype);
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Object.defineProperty(prototype, "0", { get() { console.log("get"); return 4; } });
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Object.setPrototypeOf(inherited, prototype);
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console.log([...inherited.keys()].join(","));
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console.log(JSON.stringify([...inherited.entries()]));
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const detached = sparse.entries;
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console.log(JSON.stringify([...detached.call(sparse)]));
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