mirror of https://github.com/tc39/test262.git
74 lines
2.2 KiB
JavaScript
74 lines
2.2 KiB
JavaScript
// Copyright (C) 2023 Igalia, S.L. All rights reserved.
|
|
// This code is governed by the BSD license found in the LICENSE file.
|
|
|
|
/*---
|
|
esid: sec-array.fromasync
|
|
description: >
|
|
Order of user-observable operations on a custom this-value and its instances
|
|
includes: [compareArray.js, asyncHelpers.js]
|
|
flags: [async]
|
|
features: [Array.fromAsync]
|
|
---*/
|
|
|
|
function formatPropertyName(propertyKey, objectName = "") {
|
|
switch (typeof propertyKey) {
|
|
case "symbol":
|
|
if (Symbol.keyFor(propertyKey) !== undefined) {
|
|
return `${objectName}[Symbol.for('${Symbol.keyFor(propertyKey)}')]`;
|
|
} else if (propertyKey.description.startsWith('Symbol.')) {
|
|
return `${objectName}[${propertyKey.description}]`;
|
|
} else {
|
|
return `${objectName}[Symbol('${propertyKey.description}')]`
|
|
}
|
|
case "string":
|
|
if (propertyKey !== String(Number(propertyKey)))
|
|
return objectName ? `${objectName}.${propertyKey}` : propertyKey;
|
|
// fall through
|
|
default:
|
|
// integer or string integer-index
|
|
return `${objectName}[${propertyKey}]`;
|
|
}
|
|
}
|
|
|
|
asyncTest(async function () {
|
|
const expectedCalls = [
|
|
"construct MyArray",
|
|
"defineProperty A[0]",
|
|
"defineProperty A[1]",
|
|
"set A.length"
|
|
];
|
|
const actualCalls = [];
|
|
|
|
function MyArray(...args) {
|
|
actualCalls.push("construct MyArray");
|
|
return new Proxy(Object.create(null), {
|
|
set(target, key, value) {
|
|
actualCalls.push(`set ${formatPropertyName(key, "A")}`);
|
|
return Reflect.set(target, key, value);
|
|
},
|
|
defineProperty(target, key, descriptor) {
|
|
actualCalls.push(`defineProperty ${formatPropertyName(key, "A")}`);
|
|
return Reflect.defineProperty(target, key, descriptor);
|
|
}
|
|
});
|
|
}
|
|
|
|
let result = await Array.fromAsync.call(MyArray, [1, 2]);
|
|
assert.compareArray(expectedCalls, actualCalls, "order of operations for array argument");
|
|
|
|
actualCalls.splice(0); // reset
|
|
|
|
const expectedCallsForArrayLike = [
|
|
"construct MyArray",
|
|
"defineProperty A[0]",
|
|
"defineProperty A[1]",
|
|
"set A.length"
|
|
];
|
|
result = await Array.fromAsync.call(MyArray, {
|
|
length: 2,
|
|
0: 1,
|
|
1: 2
|
|
});
|
|
assert.compareArray(expectedCallsForArrayLike, actualCalls, "order of operations for array-like argument");
|
|
});
|