mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-10-26 06:34:20 +08:00
Chris Tate
022ac6eba9
Arrays whose elements are class-backed interface values are native arrays of the element capsules, so iteration, indexing and most array methods no longer go through the checked-dynamic array, and method calls receive a receiver they can dispatch. Methods without a native form for these elements run on the array's live dynamic view. A read of an interface property signature has the property's static type and reads the field of an implementing class directly. Accessors, object literals and JavaScript classes keep the checked property read.
54 lines
1.3 KiB
TypeScript
54 lines
1.3 KiB
TypeScript
// Property reads through interfaces that return class instances, optional
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// values and nested interface values: reads return the stored objects, and
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// a read after a write sees the new value.
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class Owner {
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name: string;
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constructor(name: string) {
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this.name = name;
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}
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}
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interface Node {
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value: number;
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owner: Owner;
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next: Node | null;
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}
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class ListNode implements Node {
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value: number;
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owner: Owner;
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next: Node | null = null;
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constructor(value: number, owner: Owner) {
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this.value = value;
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this.owner = owner;
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}
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}
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class Sentinel implements Node {
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value = -1;
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owner = new Owner("sentinel");
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next: Node | null = null;
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}
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const ann = new Owner("ann");
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const head: Node = new ListNode(1, ann);
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const second = new ListNode(2, ann);
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head.next = second;
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second.next = new Sentinel();
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console.log(head.owner === ann, head.owner.name, head.next === second);
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let total = 0;
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let names = "";
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for (let node: Node | null = head; node !== null; node = node.next) {
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total += node.value;
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names += node.owner.name + ";";
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}
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console.log(total, names);
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head.owner = new Owner("bob");
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console.log(head.owner.name, second.owner.name);
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const literal: Node = { value: 5, owner: ann, next: head };
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const linked = literal.next;
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console.log(literal.owner === ann, linked === head, linked === null ? -1 : linked.value);
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