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javascript for 🐜's, a tiny runtime with big ambitions antjs.org
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768const assert = require('node:assert');
for (const Base of [ Int8Array, Uint8Array, Uint8ClampedArray, Int16Array, Uint16Array, Int32Array, Uint32Array, Float32Array, Float64Array, BigInt64Array, BigUint64Array, ...(typeof Float16Array === 'function' ? [Float16Array] : []),]) { class Sub extends Base { marker() { return 'sub'; } } class Deep extends Sub {} const bigint = Base === BigInt64Array || Base === BigUint64Array; const one = bigint ? 1n : 1; const two = bigint ? 2n : 2; const values = [one, two]; const buffer = new ArrayBuffer(Base.BYTES_PER_ELEMENT * 4); for (const args of [ [], [2], [values], [new Base(values)], [new Set(values)], [{ 0: one, 1: two, length: 2 }], [buffer, Base.BYTES_PER_ELEMENT, 2], ]) { const value = new Sub(...args); assert.strictEqual(Object.getPrototypeOf(value), Sub.prototype, Base.name); assert.ok(value instanceof Sub); assert.ok(value instanceof Base); assert.strictEqual(value.marker(), 'sub'); if (value.length) { value[0] = two; assert.strictEqual(value[0], two); } } assert.strictEqual(Object.getPrototypeOf(new Deep(2)), Deep.prototype); const Bound = Sub.bind(null, 2); assert.strictEqual(Object.getPrototypeOf(new Bound()), Sub.prototype);
function Alternate() {} assert.strictEqual(Object.getPrototypeOf(Reflect.construct(Base, [2], Alternate)), Alternate.prototype); Alternate.prototype = 1; assert.strictEqual(Object.getPrototypeOf(Reflect.construct(Base, [2], Alternate)), Base.prototype);}
for (const Base of [ArrayBuffer, DataView]) { class Sub extends Base { marker() { return 'sub'; } } class Deep extends Sub {} const args = Base === ArrayBuffer ? [16] : [new ArrayBuffer(16), 4, 8]; const value = new Sub(...args); assert.strictEqual(Object.getPrototypeOf(value), Sub.prototype); assert.ok(value instanceof Sub); assert.ok(value instanceof Base); assert.strictEqual(value.marker(), 'sub'); assert.strictEqual(value.byteLength, Base === ArrayBuffer ? 16 : 8); if (Base === DataView) { value.setUint8(0, 42); assert.strictEqual(value.getUint8(0), 42); assert.strictEqual(value.byteOffset, 4); assert.strictEqual(value.buffer, args[0]); } else { const view = new Uint8Array(value); view[0] = 42; assert.strictEqual(view[0], 42); } assert.strictEqual(Object.getPrototypeOf(new Deep(...args)), Deep.prototype); const Bound = Sub.bind(null, ...args); assert.strictEqual(Object.getPrototypeOf(new Bound()), Sub.prototype); function Alternate() {} assert.strictEqual(Object.getPrototypeOf(Reflect.construct(Base, args, Alternate)), Alternate.prototype); Alternate.prototype = null; assert.strictEqual(Object.getPrototypeOf(Reflect.construct(Base, args, Alternate)), Base.prototype);}console.log('buffer:subclass:ok');