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javascript for 🐜's, a tiny runtime with big ambitions antjs.org
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1234567891011121314151617181920212223function assert(cond, msg) { if (!cond) throw new Error(msg);}
console.log("array prototype and subclassing regression");
assert(Array.isArray(Array.prototype), "Array.prototype should be an array exotic");assert(Object.getPrototypeOf(Array.prototype) === Object.prototype, "Array.prototype should inherit from Object.prototype");
class C extends Array {}const c = new C(1, 2, 3);
assert(c instanceof C, "Array subclass instances should preserve subclass identity");assert(c instanceof Array, "Array subclass instances should still be arrays");assert(c.concat(4) instanceof C, "concat should preserve Array subclass");assert(c.map(x => x) instanceof C, "map should preserve Array subclass");assert(c.filter(() => true) instanceof C, "filter should preserve Array subclass");assert(c.slice(0) instanceof C, "slice should preserve Array subclass");assert(C.from([1, 2]) instanceof C, "Array.from on subclass should preserve subclass");assert(C.of(1, 2) instanceof C, "Array.of on subclass should preserve subclass");
console.log("PASS");