Ruby Examples

level6/51.rb

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+#!/usr/bin/ruby
+# -*- coding: utf-8 -*-
+
+=begin
+문자열에서 모음 개수 세기
+=end
+
+str = "Hello World"
+
+puts str.count("aeiou")

level6/52.rb

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+#!/usr/bin/ruby
+# -*- coding: utf-8 -*-
+
+=begin
+문자열 뒤집기
+=end
+
+str = "Hello World"
+
+puts str.reverse

level6/53.rb

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+#!/usr/bin/ruby
+# -*- coding: utf-8 -*-
+
+=begin
+특정 문자 제거
+=end
+
+str = "Hello World"
+
+puts str.delete("aeiou")

level6/54.rb

@@ -0,0 +1,10 @@
+#!/usr/bin/ruby
+# -*- coding: utf-8 -*-
+
+=begin
+공백 기준으로 단어 분리
+=end
+
+str = "Hello World"
+
+puts str.split

level6/55.rb

@@ -0,0 +1,10 @@
+#!/usr/bin/ruby
+# -*- coding: utf-8 -*-
+
+=begin
+단어 수 세기
+=end
+
+str = "Hello World"
+
+puts str.split.count

level6/56.rb

@@ -0,0 +1,10 @@
+#!/usr/bin/ruby
+# -*- coding: utf-8 -*-
+
+=begin
+문자열이 회문인지 검사
+=end
+
+str = "Hello World"
+
+puts str == str.reverse

level6/57.rb

@@ -0,0 +1,14 @@
+#!/usr/bin/ruby
+# -*- coding: utf-8 -*-
+
+=begin
+이메일 형식 간단 검증
+=end
+
+str = "hello@examples.com"
+
+puts str =~ /\A\S+@\S+\.\S+\z/ ? "Valid" : "Invalid"
+
+# ---
+
+puts str.match?(/\A\S+@\S+\.\S+\z/) ? "Valid" : "Invalid"

level6/58.rb

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+#!/usr/bin/ruby
+# -*- coding: utf-8 -*-
+
+=begin
+파일명에서 확장자 추출
+=end
+
+str = "hello.txt"
+
+puts File.extname(str)

level6/59.rb

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+#!/usr/bin/ruby
+# -*- coding: utf-8 -*-
+
+=begin
+snake_case → camelCase 변환
+=end
+
+str = "hello_world"
+
+puts str.split("_")
+        .map { |s| s.capitalize}
+        .join
+
+# ---
+
+x = str.gsub(/_[a-z]/) do |s|
+  s.to_s.delete("_").upcase
+end
+puts x

level6/60.rb

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+#!/usr/bin/ruby
+# -*- coding: utf-8 -*-
+
+=begin
+문자열 압축 (aaabb → a3b2)
+=end
+
+str = "hello world"
+
+
+puts str.chars
+        .chunk{|c| c.itself}
+        .map{|c,a| "#{c}#{a.size}"}.join