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package com.javatechie.lambda.demo.src.module1_lambda;

/**

* Practice template for custom functional interfaces using Lambda expressions.

public class LambdaBasics {

// 1. Custom Math Operation Interface

@FunctionalInterface

public interface MathOperation {

int operate(int a, int b);

}

// 2. Custom String Formatter Interface

@FunctionalInterface

public interface StringFormatter {

String format(String input);

}

// Helper method that uses MathOperation

public static int executeOperation(int a, int b, MathOperation op) {

return op.operate(a, b);

}

// Helper method that uses StringFormatter

public static String formatString(String input, StringFormatter formatter) {

return formatter.format(input);

}

public static void main(String[] args) {

System.out.println("=== 1. Custom Math Operations ===");

// TODO: Implement MathOperation for Addition using Lambda

MathOperation addition = (a, b) -> 0; // Replace with lambda expression

// TODO: Implement MathOperation for Multiplication using Lambda

MathOperation multiplication = (a, b) -> 0; // Replace with lambda expression

// TODO: Implement MathOperation for Division using Lambda (ensure you handle division by zero or assume b != 0 for now)

MathOperation division = (a, b) -> 0; // Replace with lambda expression

System.out.println("Addition (10 + 5): " + executeOperation(10, 5, addition));

System.out.println("Multiplication (10 * 5): " + executeOperation(10, 5, multiplication));

System.out.println("Division (10 / 5): " + executeOperation(10, 5, division));

System.out.println("\n=== 2. Custom String Formatters ===");

// TODO: Implement StringFormatter to convert input to uppercase

StringFormatter toUpperCase = input -> ""; // Replace with lambda expression

// TODO: Implement StringFormatter to reverse the input string

StringFormatter reverse = input -> ""; // Replace with lambda expression

// TODO: Implement StringFormatter to wrap input with brackets, e.g. "[input]"

StringFormatter bracketWrap = input -> ""; // Replace with lambda expression

String rawText = "LambdaPractice";

System.out.println("Uppercase: " + formatString(rawText, toUpperCase));

System.out.println("Reversed: " + formatString(rawText, reverse));

System.out.println("Bracket Wrapped: " + formatString(rawText, bracketWrap));

System.out.println("\n=== 3. Scoping Rules and Variable Capture ===");

int multiplier = 5;

// TODO: Create a MathOperation using Lambda that multiplies 'a' and 'b' and then multiplies the result by the local variable 'multiplier'

// Check if you can modify the variable 'multiplier' after creating/executing the lambda.

MathOperation scaledMultiply = (a, b) -> 0; // Replace with lambda expression

System.out.println("Scaled Multiplication (2 * 3 * 5): " + executeOperation(2, 3, scaledMultiply));

}

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