onResult

onResult is a common callback pattern used in asynchronous programming. It allows a piece of code to signal the completion of an operation and provide the result of that operation, or an error that occurred, to another part of the program that initiated it. This is particularly useful when dealing with operations that take time, such as network requests, file I/O, or complex computations, where blocking the main thread would lead to an unresponsive user interface or system.

Typically, an onResult callback is defined as a function or method that accepts two parameters. The first parameter is usually an error object, which is null or undefined if the operation was successful. The second parameter is the actual result of the operation, which is only valid if no error occurred. This convention helps developers clearly distinguish between successful outcomes and failures.

The implementation of onResult can vary across different programming languages and frameworks. In Java, it might be an interface with a single method. In JavaScript, it is often a function passed as an argument. The core principle remains the same: a mechanism for asynchronous communication and result handling, promoting non-blocking operations and improving application responsiveness. Developers can then implement the logic within the onResult callback to process the data received or handle any encountered errors.