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‎code.md

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Current Directory : /in28Minutes/git/functional-programming-with-java
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-->
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## JShell Commands Executed
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```java
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System.out.println("Ranga")
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List<Integer> numbers = List.of(12, 9, 13, 4, 6, 2, 4, 12, 15);
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numbers.stream().reduce(0, (x,y)->x+y)
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numbers.stream().reduce(0, (x,y)->x)
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numbers.stream().reduce(0, (x,y)->y)
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numbers.stream().reduce(0, (x,y)-> x>y ? x:y)
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numbers.stream().reduce(Integer.MIN_VALUE, (x,y)-> x>y ? x:y)
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numbers.stream().reduce(Integer.MIN_VALUE, (x,y)-> x>y ? y:x)
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numbers.stream().reduce(Integer.MAX_VALUE, (x,y)-> x>y ? y:x)
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numbers.stream().reduce(0, (x,y) -> x*x + y*y)
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numbers.stream().map(x -> x*x).reduce(0, Integer::sum)
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numbers.stream().map(x -> x*x*x).reduce(0, Integer::sum)
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numbers.stream().filter(x -> x%2==1).reduce(0, Integer::sum)
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numbers.stream().filter(x -> x%2==0).reduce(0, Integer::sum)
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numbers.stream().distinct().forEach(System.out::println)
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numbers.stream().sorted().forEach(System.out::println)
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numbers.stream().distinct().sorted().forEach(System.out::println)
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List<String> courses = List.of("Spring", "Spring Boot", "API" , "Microservices","AWS", "PCF","Azure", "Docker", "Kubernetes");
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courses.stream().sorted().forEach(System.out::println)
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courses.stream().sorted(Comparator.naturalOrder()).forEach(System.out::println)
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courses.stream().sorted(Comparator.reverseOrder()).forEach(System.out::println)
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courses.stream().sorted(Comparator.comparing(str -> str.length())).forEach(System.out::println)
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courses.stream().map(x -> x.length()).collect(Collectors.toList())
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numbers.stream().map(x -> x*x).collect(Collectors.toList())
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Supplier<String> supplier = () -> {return "Ranga";};
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Consumer<String> consumer = (str) -> { System.out.println(str);System.out.println(str);};
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List<Integer> numbers = List.of(12, 9, 13, 4, 6, 2, 4, 12, 15);
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numbers.stream()
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Stream.of(12, 9, 13, 4, 6, 2, 4, 12, 15).count()
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Stream.of(12, 9, 13, 4, 6, 2, 4, 12, 15).reduce(0, Integer::sum)
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Stream.of(12, 9, 13, 4, 6, 2, 4, 12, 15)
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int[] numberArray = {12, 9, 13, 4, 6, 2, 4, 12, 15};
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Arrays.stream(numberArray)
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Arrays.stream(numberArray).sum()
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Arrays.stream(numberArray).average()
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Arrays.stream(numberArray).min()
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Arrays.stream(numberArray).max()
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IntStream.range(1,10)
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IntStream.range(1,10).sum()
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IntStream.rangeClosed(1,10).sum()
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IntStream.iterate(1, e -> e + 2).limit(10).sum()
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IntStream.iterate(1, e -> e + 2).limit(10).peek(System.out::println).sum()
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IntStream.iterate(2, e -> e + 2).limit(10).peek(System.out::println).sum()
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IntStream.iterate(2, e -> e * 2).limit(10).peek(System.out::println).sum()
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IntStream.iterate(2, e -> e * 2).limit(10).boxed().collect(Collectors.toList())
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Integer.MAX_VALUE
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Long.MAX_VALUE
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IntStream.rangeClosed(1,50).reduce(1, (x,y)->x*y)
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LongStream.rangeClosed(1,50).reduce(1, (x,y)->x*y)
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LongStream.rangeClosed(1,50).reduce(1L, (x,y)->x*y)
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LongStream.rangeClosed(1,10).reduce(1, (x,y)->x*y)
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LongStream.rangeClosed(1,20).reduce(1, (x,y)->x*y)
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LongStream.rangeClosed(1,40).reduce(1, (x,y)->x*y)
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LongStream.rangeClosed(1,50).mapToObj(BigInteger::valueOf).reduce(BigInteger.ONE, BigInteger::multiply)
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courses.stream().collect(Collectors.joining(" "))
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courses.stream().collect(Collectors.joining(","))
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"Spring".split("")
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courses.stream().map(course -> course.split("")).collect(Collectors.toList())
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courses.stream().map(course -> course.split(""))
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courses.stream().map(course -> course.split("")).flatMap(Arrays::stream).collect(Collectors.toList())
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courses.stream().map(course -> course.split("")).flatMap(Arrays::stream).distinct().collect(Collectors.toList())
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List<String> courses = List.of("Spring", "Spring Boot", "API" , "Microservices","AWS", "PCF","Azure", "Docker", "Kubernetes");
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List<String> courses2 = List.of("Spring", "Spring Boot", "API" , "Microservices","
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AWS", "PCF","Azure", "Docker", "Kubernetes");
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courses.stream().flatMap(course -> courses2.stream().map(course2 -> List.of(course,course2))).collect(Collectors.toList())
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courses.stream().flatMap(course -> courses2.stream().map(course2 -> List.of(course,course2))).filter(list -> list.get(0).equals(list.get(1))).collect(Collectors.toList())
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courses.stream().flatMap(course -> courses2.stream().map(course2 -> List.of(course,course2))).filter(list -> !list.get(0).equals(list.get(1))).collect(Collectors.toList())
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courses.stream().flatMap(course -> courses2.stream().filter(course2 -> course2.length()==course.length()).map(course2 -> List.of(course,course2))).filter(list -> !list.get(0).equals(list.get(1))).collect(Collectors.toList())
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courses.stream().filter(courses -> courses.length()>11).map(String::toUpperCase).findFirst()
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courses.stream().peek(System.out::println).filter(courses -> courses.length()>11).map(String::toUpperCase).peek(System.out::println).findFirst()
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courses.stream().peek(System.out::println).filter(courses -> courses.length()>11).map(String::toUpperCase).peek(System.out::println)
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$4.findFirst()//Change $4 to your variable name
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List<String> courses = List.of("Spring", "Spring Boot", "API" , "Microservices","AWS", "PCF","Azure", "Docker", "Kubernetes");
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courses.replaceAll( str -> str.toUpperCase()) //Error
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List<String> modifyableCourses = new ArrayList(courses);
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modifyableCourses.replaceAll(str -> str.toUpperCase())
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modifyableCourses.removeIf(course -> course.length()<6)
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```
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## Complete Code Examples
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@@ -971,101 +1097,3 @@ public class FP03LambdaExpressions {
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}
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}
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```
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---
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### JShell Commands Executed
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```java
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System.out.println("Ranga")
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List<Integer> numbers = List.of(12, 9, 13, 4, 6, 2, 4, 12, 15);
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numbers.stream().reduce(0, (x,y)->x+y)
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numbers.stream().reduce(0, (x,y)->x)
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numbers.stream().reduce(0, (x,y)->y)
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numbers.stream().reduce(0, (x,y)-> x>y ? x:y)
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numbers.stream().reduce(Integer.MIN_VALUE, (x,y)-> x>y ? x:y)
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numbers.stream().reduce(Integer.MIN_VALUE, (x,y)-> x>y ? y:x)
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numbers.stream().reduce(Integer.MAX_VALUE, (x,y)-> x>y ? y:x)
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numbers
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numbers
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numbers.stream().reduce(0, (x,y) -> x*x + y*y)
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numbers.stream().map(x -> x*x).reduce(0, Integer::sum)
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numbers.stream().map(x -> x*x*x).reduce(0, Integer::sum)
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numbers.stream().filter(x -> x%2==1).reduce(0, Integer::sum)
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numbers.stream().filter(x -> x%2==0).reduce(0, Integer::sum)
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numbers.stream().distinct().forEach(System.out::println)
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numbers
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numbers.stream().sorted().forEach(System.out::println)
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numbers.stream().distinct().sorted().forEach(System.out::println)
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List<String> courses = List.of("Spring", "Spring Boot", "API" , "Microservices","AWS", "PCF","Azure", "Docker", "Kubernetes");
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courses
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courses.stream().sorted().forEach(System.out::println)
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courses
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courses.stream().sorted().forEach(System.out::println)
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courses.stream().sorted(Comparator.naturalOrder()).forEach(System.out::println)
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courses.stream().sorted(Comparator.reverseOrder()).forEach(System.out::println)
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courses.stream().sorted(Comparator.comparing(str -> str.length())).forEach(System.out::println)
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numbers
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courses
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courses.stream().map(x -> x.length()).collect(Collectors.toList())
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numbers.stream().map(x -> x*x).collect(Collectors.toList())
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Supplier<String> supplier = () -> {return "Ranga";};
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Consumer<String> consumer = (str) -> { System.out.println(str);System.out.println(str);};
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numbers.stream()
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List<Integer> numbers = List.of(12, 9, 13, 4, 6, 2, 4, 12, 15);
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numbers.stream()
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Stream.of(12, 9, 13, 4, 6, 2, 4, 12, 15).count()
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Stream.of(12, 9, 13, 4, 6, 2, 4, 12, 15).reduce(0, Integer::sum)
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Stream.of(12, 9, 13, 4, 6, 2, 4, 12, 15)
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int[] numberArray = {12, 9, 13, 4, 6, 2, 4, 12, 15};
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Arrays.stream(numberArray)
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Arrays.stream(numberArray).sum()
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Arrays.stream(numberArray).average()
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Arrays.stream(numberArray).min()
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Arrays.stream(numberArray).max()
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IntStream.range(1,10)
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IntStream.range(1,10).sum()
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IntStream.rangeClosed(1,10).sum()
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IntStream.iterate(1, e -> e + 2).limit(10).sum()
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IntStream.iterate(1, e -> e + 2).limit(10).peek(System.out::println).sum()
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IntStream.iterate(2, e -> e + 2).limit(10).peek(System.out::println).sum()
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IntStream.iterate(2, e -> e * 2).limit(10).peek(System.out::println).sum()
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IntStream.iterate(2, e -> e * 2).limit(10).boxed().collect(Collectors.toList())
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Integer.MAX_VALUE
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Long.MAX_VALUE
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IntStream.rangeClosed(1,50).reduce(1, (x,y)->x*y)
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LongStream.rangeClosed(1,50).reduce(1, (x,y)->x*y)
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LongStream.rangeClosed(1,50).reduce(1L, (x,y)->x*y)
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LongStream.rangeClosed(1,10).reduce(1, (x,y)->x*y)
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LongStream.rangeClosed(1,20).reduce(1, (x,y)->x*y)
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LongStream.rangeClosed(1,40).reduce(1, (x,y)->x*y)
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LongStream.rangeClosed(1,50).mapToObj(BigInteger::valueOf).reduce(BigInteger.ONE, BigInteger::multiply)
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courses.stream().collect(Collectors.joining(" "))
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courses.stream().collect(Collectors.joining(","))
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"Spring".split("")
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courses.stream().map(course -> course.split("")).collect(Collectors.toList())
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courses.stream().map(course -> course.split(""))
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courses.stream().map(course -> course.split("")).flatMap(Arrays::stream).collect(Collectors.toList())
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courses.stream().map(course -> course.split("")).flatMap(Arrays::stream).distinct().collect(Collectors.toList())
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List<String> courses = List.of("Spring", "Spring Boot", "API" , "Microservices","AWS", "PCF","Azure", "Docker", "Kubernetes");
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List<String> courses2 = List.of("Spring", "Spring Boot", "API" , "Microservices","AWS", "PCF","Azure", "Docker", "Kubernetes");
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courses.stream().flatMap(course -> courses2.stream().map(course2 -> List.of(course,course2))).collect(Collectors.toList())
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courses.stream().flatMap(course -> courses2.stream().map(course2 -> List.of(course,course2))).filter(list -> list.get(0).equals(list.get(1))).collect(Collectors.toList())
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courses.stream().flatMap(course -> courses2.stream().map(course2 -> List.of(course,course2))).filter(list -> !list.get(0).equals(list.get(1))).collect(Collectors.toList())
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courses.stream().flatMap(course -> courses2.stream().filter(course2 -> course2.length()==course.length()).map(course2 -> List.of(course,course2))).filter(list -> !list.get(0).equals(list.get(1))).collect(Collectors.toList())
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courses.stream().filter(courses -> courses.length()>11).map(String::toUpperCase).findFirst()
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courses.stream().peek(System.out::println).filter(courses -> courses.length()>11).map(String::toUpperCase).peek(System.out::println).findFirst()
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courses.stream().peek(System.out::println).filter(courses -> courses.length()>11).map(String::toUpperCase).peek(System.out::println)
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$4.findFirst()
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List<String> courses = List.of("Spring", "Spring Boot", "API" , "Microservices","AWS", "PCF","Azure", "Docker", "Kubernetes");
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courses.replaceAll( str -> str.toUpperCase())
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List<String> modifyableCourses = new ArrayList(courses);
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modifyableCourses.replaceAll(str -> str.toUpperCase())
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modifyableCourses
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modifyableCourses.removeIf(course -> course.length()<6)
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modifyableCourses
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```

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