When some of your application functions takes too long to compute, a useful technique to consider is caching. Caching saves the return values of function calls, database queries, HTTP requests, and so on for future reference. The result of a function or method that is expensive to run can be cached as long as the following prerequisites are met:
- The function is deterministic and the results have the same value every time, given the same input
- The return value of the function is nondeterministic but continues to be useful and valid for some period of time
In other words, a deterministic function always returns the same result for the same set of arguments, whereas a nondeterministic function returns results that may vary in time. Caching both types of results usually greatly reduces the time of computation and allows you to save a lot of computer resources.
The most important...
