Add crazy lambda example

Author: tboychuk

lambdas/src/main/java/com/bobocode/CrazyLambdaExample.java

@@ -0,0 +1,32 @@
+package com.bobocode;
+
+import java.util.function.Consumer;
+import java.util.function.Function;
+import java.util.function.Predicate;
+import java.util.function.Supplier;
+
+/**
+ * An example of crazy lambda that is hard but still important to understand
+ */
+public class CrazyLambdaExample {
+    public static void main(String[] args) {
+        Supplier<Function<Predicate<String>, Consumer<String>>> stringPredicateToConsumerFunctionSupplier =
+                getStringPredicateToConsumerFunctionSupplier();
+
+        Function<Predicate<String>, Consumer<String>> stringPredicateConsumerFunction = stringPredicateToConsumerFunctionSupplier.get();
+        Consumer<String> stringIsEmptyChecker = stringPredicateConsumerFunction.apply(String::isEmpty);
+        stringIsEmptyChecker.accept("");
+    }
+
+    /**
+     * Returns the {@link Supplier} instance that supplies {@link Function} that receives a string {@link Predicate} as
+     * a parameter and returns string {@link Consumer}
+     *
+     * @return an instance of supplier
+     */
+    private static Supplier<Function<Predicate<String>, Consumer<String>>> getStringPredicateToConsumerFunctionSupplier() {
+        return () -> stringPredicate -> str -> System.out.println(stringPredicate.test(str));
+    }
+
+
+}