From 2138031fd9123b93bc23c6e0399476265ee837fd Mon Sep 17 00:00:00 2001
From: Nesmy <anastasiia.mudra.kn.2021@lpnu.ua>
Date: Fri, 11 Aug 2023 16:09:07 +0300
Subject: [PATCH] CrazyLambdas methods

---
 .../java/com/bobocode/fp/CrazyLambdas.java    | 54 ++++++++++++-------
 1 file changed, 34 insertions(+), 20 deletions(-)

diff --git a/5-0-functional-programming/5-1-1-crazy-lambdas/src/main/java/com/bobocode/fp/CrazyLambdas.java b/5-0-functional-programming/5-1-1-crazy-lambdas/src/main/java/com/bobocode/fp/CrazyLambdas.java
index c836ad51a..387ee0064 100644
--- a/5-0-functional-programming/5-1-1-crazy-lambdas/src/main/java/com/bobocode/fp/CrazyLambdas.java
+++ b/5-0-functional-programming/5-1-1-crazy-lambdas/src/main/java/com/bobocode/fp/CrazyLambdas.java
@@ -5,6 +5,7 @@
 import java.math.BigDecimal;
 import java.util.Comparator;
 import java.util.Map;
+import java.util.Random;
 import java.util.function.*;
 
 /**
@@ -27,7 +28,7 @@ public class CrazyLambdas {
      * @return a string supplier
      */
     public static Supplier<String> helloSupplier() {
-        throw new ExerciseNotCompletedException();
+        return () -> "Hello";
     }
 
     /**
@@ -36,7 +37,7 @@ public static Supplier<String> helloSupplier() {
      * @return a string predicate
      */
     public static Predicate<String> isEmptyPredicate() {
-        throw new ExerciseNotCompletedException();
+        return String::isEmpty;
     }
 
     /**
@@ -46,7 +47,7 @@ public static Predicate<String> isEmptyPredicate() {
      * @return function that repeats Strings
      */
     public static BiFunction<String, Integer, String> stringMultiplier() {
-        throw new ExerciseNotCompletedException();
+        return String::repeat;
     }
 
     /**
@@ -56,7 +57,7 @@ public static BiFunction<String, Integer, String> stringMultiplier() {
      * @return function that converts adds dollar sign
      */
     public static Function<BigDecimal, String> toDollarStringFunction() {
-        throw new ExerciseNotCompletedException();
+        return number -> "$" + number;
     }
 
     /**
@@ -68,7 +69,7 @@ public static Function<BigDecimal, String> toDollarStringFunction() {
      * @return a string predicate
      */
     public static Predicate<String> lengthInRangePredicate(int min, int max) {
-        throw new ExerciseNotCompletedException();
+        return  str -> min <= str.length() && str.length() < max;
     }
 
     /**
@@ -77,7 +78,7 @@ public static Predicate<String> lengthInRangePredicate(int min, int max) {
      * @return int supplier
      */
     public static IntSupplier randomIntSupplier() {
-        throw new ExerciseNotCompletedException();
+        return () -> new Random().nextInt();
     }
 
 
@@ -87,7 +88,7 @@ public static IntSupplier randomIntSupplier() {
      * @return int operation
      */
     public static IntUnaryOperator boundedRandomIntSupplier() {
-        throw new ExerciseNotCompletedException();
+        return bound -> new Random().nextInt(bound);
     }
 
     /**
@@ -96,7 +97,7 @@ public static IntUnaryOperator boundedRandomIntSupplier() {
      * @return square operation
      */
     public static IntUnaryOperator intSquareOperation() {
-        throw new ExerciseNotCompletedException();
+        return num -> num * num;
     }
 
     /**
@@ -105,7 +106,7 @@ public static IntUnaryOperator intSquareOperation() {
      * @return binary sum operation
      */
     public static LongBinaryOperator longSumOperation() {
-        throw new ExerciseNotCompletedException();
+        return Long::sum;
     }
 
     /**
@@ -114,7 +115,7 @@ public static LongBinaryOperator longSumOperation() {
      * @return string to int converter
      */
     public static ToIntFunction<String> stringToIntConverter() {
-        throw new ExerciseNotCompletedException();
+        return Integer::parseInt;
     }
 
     /**
@@ -125,7 +126,7 @@ public static ToIntFunction<String> stringToIntConverter() {
      * @return a function supplier
      */
     public static Supplier<IntUnaryOperator> nMultiplyFunctionSupplier(int n) {
-        throw new ExerciseNotCompletedException();
+        return () -> x -> n * x;
     }
 
     /**
@@ -134,7 +135,7 @@ public static Supplier<IntUnaryOperator> nMultiplyFunctionSupplier(int n) {
      * @return function that composes functions with trim() function
      */
     public static UnaryOperator<Function<String, String>> composeWithTrimFunction() {
-        throw new ExerciseNotCompletedException();
+        return strFunction -> strFunction.compose(String::trim);
     }
 
     /**
@@ -145,7 +146,11 @@ public static UnaryOperator<Function<String, String>> composeWithTrimFunction()
      * @return a thread supplier
      */
     public static Supplier<Thread> runningThreadSupplier(Runnable runnable) {
-        throw new ExerciseNotCompletedException();
+        return () -> {
+            Thread t = new Thread(runnable);
+            t.start();
+            return t;
+        };
     }
 
     /**
@@ -154,7 +159,7 @@ public static Supplier<Thread> runningThreadSupplier(Runnable runnable) {
      * @return a runnable consumer
      */
     public static Consumer<Runnable> newThreadRunnableConsumer() {
-        throw new ExerciseNotCompletedException();
+        return runnable -> new Thread(runnable).start();
     }
 
     /**
@@ -164,7 +169,11 @@ public static Consumer<Runnable> newThreadRunnableConsumer() {
      * @return a function that transforms runnable into a thread supplier
      */
     public static Function<Runnable, Supplier<Thread>> runnableToThreadSupplierFunction() {
-        throw new ExerciseNotCompletedException();
+        return runnable -> () -> {
+            Thread t = new Thread(runnable);
+            t.start();
+            return t;
+        };
     }
 
     /**
@@ -177,7 +186,7 @@ public static Function<Runnable, Supplier<Thread>> runnableToThreadSupplierFunct
      * @return a binary function that receiver predicate and function and compose them to create a new function
      */
     public static BiFunction<IntUnaryOperator, IntPredicate, IntUnaryOperator> functionToConditionalFunction() {
-        throw new ExerciseNotCompletedException();
+        return (intFunction, intCondition) -> intParam -> intCondition.test(intParam) ? intFunction.applyAsInt(intParam) : intParam;
     }
 
     /**
@@ -188,7 +197,7 @@ public static BiFunction<IntUnaryOperator, IntPredicate, IntUnaryOperator> funct
      * @return a high-order function that fetches a function from a function map by a given name or returns identity()
      */
     public static BiFunction<Map<String, IntUnaryOperator>, String, IntUnaryOperator> functionLoader() {
-        throw new ExerciseNotCompletedException();
+        return (map, functionName) -> map.getOrDefault(functionName, IntUnaryOperator.identity());
     }
 
     /**
@@ -206,7 +215,7 @@ public static BiFunction<Map<String, IntUnaryOperator>, String, IntUnaryOperator
      * @return a comparator instance
      */
     public static <T, U extends Comparable<? super U>> Comparator<T> comparing(Function<? super T, ? extends U> mapper) {
-        throw new ExerciseNotCompletedException();
+        return Comparator.comparing(mapper);
     }
 
     /**
@@ -226,7 +235,12 @@ public static <T, U extends Comparable<? super U>> Comparator<T> comparing(Funct
      */
     public static <T, U extends Comparable<? super U>> Comparator<T> thenComparing(
             Comparator<? super T> comparator, Function<? super T, ? extends U> mapper) {
-        throw new ExerciseNotCompletedException();
+
+        return (o1, o2) -> {
+            int result = comparator.compare(o1, o2);
+            return result != 0 ? result
+                : mapper.apply(o1).compareTo(mapper.apply(o2));
+        };
     }
 
     /**
@@ -235,7 +249,7 @@ public static <T, U extends Comparable<? super U>> Comparator<T> thenComparing(
      * @return a supplier instance
      */
     public static Supplier<Supplier<Supplier<String>>> trickyWellDoneSupplier() {
-        throw new ExerciseNotCompletedException();
+        return () -> () -> () -> "WELL DONE!";
     }
 }