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masanobuimai/switch caseの代わり

Created January 26, 2017 02:41
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switch caseの代わり
Map<String, Function<String, String>> switchCase = new HashMap<>();
switchCase.put("A", String::toLowerCase);
switchCase.put("a", String::toUpperCase);
Stream.of("A", "a", "aaa", "bbb")
.map(str -> Optional.ofNullable(switchCase.get(str))
.map(f -> f.apply(str))
.orElse(str))
.forEach(System.out::println)
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hum...
.map(str -> switchCase.getOrDefault(str, k -> str).apply(str))
.forEach(System.out::println)

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