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15 lines
556 B
JavaScript
15 lines
556 B
JavaScript
class RecordValue {
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constructor(value) { this.value = value; }
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static read(object) { return object.value; }
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static label(object) { return this.read(object) + ":" + this.tag; }
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toJSON() { return this.constructor.label(this); }
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}
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RecordValue.tag = "base";
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class Child extends RecordValue {}
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Child.tag = "child";
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const value = new Child("hello");
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console.log(value.toJSON());
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const read = Child.read;
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console.log(read === RecordValue.read, read({ value: "detached" }));
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console.log(Child.missing === undefined, Child.prototype.constructor === Child);
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