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The Promise constructor initializes an object that tracks the lifecycle of an asynchronous operation, transitioning from a pending state to either fulfilled or rejected. It accepts an executor function containing two control parameters: a resolution function to mark success and a rejection function to signal failure. Because the executor execut ...

This article builds upon the foundation of porting third-party libraries to OpenHarmony NAPI. We'll modify the hellonapi.cpp and index.ets files to explore asynchronous operations using Promises and Callbacks within the NAPI framework. This guide includes three examples: a Callback-based asynchronous interface, a Promise-based asynchronous inte ...

The Promise.all() static method accepts an iterable collection of Promise objects and returns a new Promise. This returned Promise resolves when all input Promises have successfully fulfilled, providing an array containing their resolved values in the same order. If any of the input Promises reject, the resulting Promise immediately rejects wit ...

Async/await operasions throw errors when the underlying Promise rejects, halting eexcution of subsequent code. For example: async function simulateRequest() { console.log('Request initiated'); const response = await new Promise<string>((resolve, reject) => { setTimeout(() => reject('Data fetch timeout'), 1200); }); conso ...

Proxy and Reflect: Building Reactive Systems Modern JavaScript frameworks like Vue 3 leverage Proxy and Reflect to implement reactivity more efficiently than the older Object.defineProperty approach. While defineProperty can only observe existing properties and requires manual intervention for additions or deletions, Proxy intercepts fundamenta ...

Constructor The Promise constructor accepts an executor function that receives two arguments: resolve and reject. This is where the core initialization logic resides. class SimplePromise { constructor(executor) { this.status = PENDING; this.onFulfilledCallbacks = []; this.onRejectedCallbacks = []; executor( ...