mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-11-02 07:43:42 +08:00
Chris Tate
dea433dacd
A direct call to an untyped method that returns `this` on every path, used as a statement (`builder.add(part);`), boxed its receiver into a capsule that nothing read. Such a call now runs the method's copy that returns nothing, as the class dispatch helpers already do.
47 lines
1.2 KiB
JavaScript
47 lines
1.2 KiB
JavaScript
// Untyped methods that return their receiver, called as statements on
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// receivers whose class is known: side effects, throws, overrides, and
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// results that are used.
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class Builder {
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constructor() {
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this.parts = [];
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this.count = 0;
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}
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add(part) {
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if (part === "") throw new TypeError("empty part");
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this.parts.push(part);
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this.count++;
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return this;
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}
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reset() {
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this.parts.length = 0;
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return this;
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}
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}
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class LoudBuilder extends Builder {
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add(part) {
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super.add(part.toUpperCase());
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return this;
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}
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}
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const b = new Builder();
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for (let i = 0; i < 1000; i++) {
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b.add("p" + (i % 3));
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if (i % 100 === 99) b.reset();
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}
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console.log(b.count, b.parts.join(","));
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b.add("x").add("y");
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const same = b.add("z");
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console.log(same === b, b.parts.join(","));
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try {
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b.add("");
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} catch (e) {
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console.log(e instanceof TypeError, e.message, b.count);
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}
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const loud = new LoudBuilder();
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loud.add("a");
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loud.add("b").add("c");
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console.log(loud.parts.join(","), loud.count, loud instanceof Builder);
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const builders = [new Builder(), new LoudBuilder()];
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for (const each of builders) each.add("q");
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console.log(builders.map((each) => each.parts.join("")).join("|"));
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