"Editor's note: This article was updated by Chinwike Maduabuchi in January 2026 to include modern async patterns. These updates cover working with data streams using for await...of, handling cancellation with AbortController, and coordinating concurrent tasks with Promise.all. Asynchronous programming is a way of writing code that can carry out tasks independently of each other, not needing one task to be completed before another gets started. When you think of asynchronous programming, think of multitasking and effective time management."
"Understanding promises in TypeScript Before diving into async/await, it's important to mention that promises form the foundation of asynchronous programming in JavaScript/ TypeScript. A promise represents a value that might not be immediately available but will be resolved at some point in the future. A promise can be in one of the following three states: Pending - Initial state, neither fulfilled nor rejected Fulfilled - Operation completed successfully Rejected - Operation failed"
Promises are the foundation of asynchronous programming in TypeScript and represent values that resolve in the future with pending, fulfilled, or rejected states. Type-safe Promise creation can use interfaces to define response shapes and simulate API calls that resolve with data and timestamps. Promises can be chained with .then() and errors handled with .catch(). Async/await builds on promises to write clearer asynchronous code. Modern patterns include using for await...of to consume data streams, AbortController to handle cancellation, and Promise.all to coordinate concurrent tasks, enabling efficient multitasking and time management in code.
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