A Trade goes through 3 state changes – placed, filled, and settled. Let’s solve this simple problem using both OOP & FP approaches.
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Blog Archives
02: OOP vs FP with Java example – Conversion strategy pattern
Java code to convert given input values from KM to Meter, Meter to Centimetres, etc. OOP approach using the strategy design pattern Step 1: Define an interface. … Read more...
03: Java FP composing functions example – calculate discount
FP – calculate the invoice price Invoice Price = (markedPrice * (100 – discountRate)/100) + deliveryCharge Example “f.andThen(g)” is the composition of functions. This can be described as g(f()) where...
04: Java OOP vs FP – Builder Pattern
Current Balance = Initial Amounts + Credits – Debits OOP approach using the builder design pattern Creating a constructor to take three BigDecimal values is NOT only readable, … Read...
05: Java OOP vs FP – Handling unchecked exceptions
int result = input / divideBy will throw an unchecked exception if divideBy = 0. OOP error handling by throwing exceptions In OOP errors are handled by throwing & …...
06: Java FP – handling checked exceptions
FP error handling – checked exceptions The code below breaks the flow of execution as the input “ABC” throws a checked exception – “NumberFormatException”. Outputs: What if you want to...
07: Java FP – CompletableFuture monadic chaining with examples – part 1
This extends Future Vs. CompletableFuture interview Q&As with Java 8 functional programming (i.e. FP). Q1. Why was CompletableFuture introduced in Java 8 when you already had the Future interface? …...
08: CompletableFuture monadic chaining with examples – part 2
This extends Java FP – CompletableFuture monadic chaining with examples – part 1. f and g are processed asynchronously, and then combined A “Supplier” returns a result by taking nothing...
09: Java FP – CompletableFuture Error Handling
handle(…) returns a result or an exception A dummy exception is thrown from “f” to demonstrate an exceptional scenario. The “java.util.concurrent.ExecutionException” potentially thrown by f.get(), g.get(), and h.get() is a...
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