What is a Postponer in Functional Programming?

A postponer is a mechanism that allows you to delay the execution of a task or function until a specific event occurs. In other words, it's a way to "postpone" the execution of a task until a certain condition is met.

For example, you might use a postponer to delay the execution of a function until a specific variable reaches a certain value, or until a specific time interval has passed. This can be useful in situations where you want to perform some action only when certain conditions are met, rather than executing the action immediately.

Postponers are often used in conjunction with other functional programming concepts, such as higher-order functions and closures, to create more complex and flexible software systems. They can also be used to implement more advanced programming patterns, such as the "strategy" pattern, which allows you to decouple the implementation of a function from its interface.