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https://github.com/vercel-labs/scriptc.git
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Chris Tate
fc6408a662
- Keep cached native class instances callable, including inherited methods and JavaScript arguments. - Support plain-object Proxy traps with live receivers, enumeration, and data-property invariants. - Compile untyped addition, computed environment keys, and text-codec startup storage natively.
21 lines
1.2 KiB
JavaScript
21 lines
1.2 KiB
JavaScript
function add(a, b) { return a + b; }
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console.log(add(2, 3), add("2", 3), add(2, "3"), add(true, null));
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console.log(add(undefined, 3), add([1, 2], [3]), add({}, 1));
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let trace = "";
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const left = { value: "left", valueOf: function() { trace += "L"; return this.value; } };
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const right = { valueOf() { trace += "R"; return 2; } };
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console.log(add(left, right), trace);
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console.log(add({ valueOf() { return {}; }, toString() { return "fallback"; } }, 4));
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console.log(add({ valueOf() { return false; } }, true));
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try { add({ valueOf() { throw new Error("conversion"); } }, right); }
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catch (error) { console.log(error.message, trace); }
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try { add({ valueOf() { return {}; }, toString() { return {}; } }, 1); }
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catch (error) { console.log(error.name, error.message); }
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const empty = Object.create(null);
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try { add(empty, "x"); } catch (error) { console.log(error.name); }
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function stringLeft(value) { return "prefix:" + value; }
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console.log(stringLeft({ valueOf() { return 8; }, toString() { return "wrong"; } }));
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function removeHook(object) { delete object.valueOf; }
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const changing = { valueOf: function() { removeHook(this); return 6; } };
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console.log(add(changing, 1), add(changing, 1));
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