Rubyã®ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆå¼•æ•°ã§å†å¸° - ( ꒪⌓꒪) ゆるよã‚日記Rubyã®ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆå¼•æ•°ã§ã¯ã€ä»–ã®å¼•æ•°ã«ä¾å˜ã—ãŸå¼ã‚’書ã‘る。地味ã«ä¾¿åˆ©ã€‚ [1] pry(main)> def foo(a, b = a * 2) [1] pry(main)* puts b [1] pry(main)* end => nil [2] pry(main)> foo(3) 6 => nil å†å¸°ã‚‚ã‹ã‘る。デフォルト引数ã§å†å¸°ã•ã›ã¦ãƒ•ã‚£ãƒœãƒŠã£ã¦ã¿ã‚‹ [3] pry(main)> def fib(n,r = (n <=1 ? n : fib(n-2) + fib(n-1))) [3] pry(main)* r [3] pry(main)* end => nil [4] pry(main)> 11.times do |n| puts "fib(#{n}) => #{fib(n)}" end fib(0) => 0 fib(1) => 1 fib(2) => 1 fib(3) =>
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