Using the JavaScript Either monad for error handling

Handling errors in JavaScript using try...catch blocks is beneficial for separating the "happy path" of code execution from error handling, but it can also lead to impure code and overlooked exceptions. The article introduces the Either monad as an alternative, which provides a structured way to handle errors without interrupting the program flow. By using Left and Right classes to represent errors and successful outcomes, respectively, the Either monad maintains functional purity and ensures error handling is not neglected. The approach involves chaining operations with map and chain methods, allowing for a clean syntax and encapsulated error management. The article suggests the use of established libraries like Crocks or Sanctuary for practical implementations of the Either monad, emphasizing its advantages over traditional exception handling, such as avoiding clutter and maintaining code clarity.