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| 1 | +package com.platzi.functional._07_inference; |
| 2 | + |
| 3 | +import java.util.Arrays; |
| 4 | +import java.util.LinkedList; |
| 5 | +import java.util.List; |
| 6 | +import java.util.stream.Stream; |
| 7 | + |
| 8 | +public class Inference { |
| 9 | + private static void typeInference() { |
| 10 | + List<Integer> numbersList = getNumbers(); |
| 11 | + |
| 12 | + /* |
| 13 | + La parte interesante de la inferencia de tipos es que |
| 14 | + Java puede identificar de una funcion que tipo de parametro y retorno tiene y |
| 15 | + con ello darnos acceso a ese tipo en la siguiente funcion. |
| 16 | + */ |
| 17 | + getOperable(numbersList) |
| 18 | + .filter(n -> n % 10 == 0) |
| 19 | + .map(n -> { |
| 20 | + char[] repeater = new char[n]; |
| 21 | + Arrays.fill(repeater, '!'); |
| 22 | + return repeater; |
| 23 | + }) |
| 24 | + .map(String::new) |
| 25 | + .forEach(System.out::println); |
| 26 | + |
| 27 | + |
| 28 | + |
| 29 | + |
| 30 | + |
| 31 | + |
| 32 | + |
| 33 | + |
| 34 | + |
| 35 | + |
| 36 | + |
| 37 | + |
| 38 | + /* |
| 39 | + Sin la inferencia el codigo de arriba se veria muchisimo mas largo y menos declarativo |
| 40 | +
|
| 41 | + Aunque estos factores no son malos, en muchas ocasiones restan legibilidad en el codigo. |
| 42 | + */ |
| 43 | + getOperable(numbersList) |
| 44 | + .filter((Integer n) -> n % 10 == 0) |
| 45 | + .map((Integer n) -> { |
| 46 | + char[] repeater = new char[n]; |
| 47 | + Arrays.fill(repeater, '!'); |
| 48 | + return repeater; |
| 49 | + }) |
| 50 | + .map((char[] chars) -> new String(chars)) |
| 51 | + .forEach((String str) -> System.out.println(str)); |
| 52 | + } |
| 53 | + |
| 54 | + |
| 55 | + |
| 56 | + |
| 57 | + |
| 58 | + |
| 59 | + |
| 60 | + |
| 61 | + |
| 62 | + |
| 63 | + |
| 64 | + |
| 65 | + |
| 66 | + private static List<Integer> getNumbers(){ |
| 67 | + List<Integer> numbers = new LinkedList<>(); |
| 68 | + numbers.add(1); |
| 69 | + numbers.add(10); |
| 70 | + numbers.add(11); |
| 71 | + numbers.add(100); |
| 72 | + numbers.add(1001); |
| 73 | + numbers.add(1010); |
| 74 | + numbers.add(1100); |
| 75 | + numbers.add(1111); |
| 76 | + |
| 77 | + return numbers; |
| 78 | + } |
| 79 | + |
| 80 | + |
| 81 | + |
| 82 | + |
| 83 | + |
| 84 | + |
| 85 | + |
| 86 | + |
| 87 | + |
| 88 | + |
| 89 | + |
| 90 | + |
| 91 | + |
| 92 | + |
| 93 | + |
| 94 | + |
| 95 | + |
| 96 | + |
| 97 | + |
| 98 | + |
| 99 | + private static Stream<Integer> getOperable(List<Integer> list) { |
| 100 | + return list.stream(); |
| 101 | + } |
| 102 | +} |
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