Ruby的字符串与数组求最大值的相关问题讨论

b=[1,3,55,777,2,4,6,8,0]

b.max => 777b.min => 0

# enum.max         -> obj# enum.max { |a, b| block } -> obj#a = %w(albatross dog horse)#a.max          => "horse"# a.max { |a, b| a.length <=> b.length } #=> "albatross"

d=%w(albatross dog horse ddd dasgfds)d.max => "horse"

a = ["1", "3", "55", "777", "2", "4", "6", "8", "0"]def max(first,*rest)  max=first  rest.each do |x|  p "---#{x}---#{max}"  max=x if x>max   p "---#{x}---#{max}"  max end

"---3---1""---3---3""---55---3""---55---55""---777---55""---777---777""---2---777""---2---777""---4---777""---4---777""---6---777""---6---777""---8---777""---8---8""---0---8""---0---8" => "8"

"7" > "777" => false"6" > "777" => false"9" > "777" => true"10" > "777" => false"11" > "777" => false"70" > "777" => false"80" > "777" => true

ary.sort          -> new_aryary.sort { |a, b| block } -> new_aryenum.sort_by { |obj| block }  -> arrayenum.sort_by          -> an_enumerator

h=['1','3','13','10','7'] A. p h.sort B. p h.sort{|a,b| a.to_i <=> b.to_i} C. p h.sort_by{|x| x.to_i}

A. ["1", "10", "13", "3", "7"] B. ["1", "3", "7", "10", "13"] C. ["1", "3", "7", "10", "13"]