详解Ruby中范围的概念

(1..5)    #==> 1, 2, 3, 4, 5
(1...5)    #==> 1, 2, 3, 4
('a'..'d')  #==> 'a', 'b', 'c', 'd'

#!/usr/bin/ruby

$, =", "  # Array value separator
range1 = (1..10).to_a
range2 = ('bar'..'bat').to_a

puts "#{range1}"
puts "#{range2}"

1, 2, 3, 4, 5, 6, 7, 8, 9, 10
bar, bas, bat

#!/usr/bin/ruby

# Assume a range
digits = 0..9

puts digits.include?(5)
ret = digits.min
puts "Min value is #{ret}"

ret = digits.max
puts "Max value is #{ret}"

ret = digits.reject {|i| i < 5 }
puts "Rejected values are #{ret}"

digits.each do |digit|
  puts "In Loop #{digit}"
end

true
Min value is 0
Max value is 9
Rejected values are 5, 6, 7, 8, 9
In Loop 0
In Loop 1
In Loop 2
In Loop 3
In Loop 4
In Loop 5
In Loop 6
In Loop 7
In Loop 8
In Loop 9

while gets
  print if /start/../end/
end

#!/usr/bin/ruby

score = 70

result = case score
  when 0..40: "Fail"
  when 41..60: "Pass"
  when 61..70: "Pass with Merit"
  when 71..100: "Pass with Distinction"
  else "Invalid Score"
end

puts result

Pass with Merit

#!/usr/bin/ruby

if ((1..10) === 5)
 puts "5 lies in (1..10)"
end

if (('a'..'j') === 'c')
 puts "c lies in ('a'..'j')"
end

if (('a'..'j') === 'z')
 puts "z lies in ('a'..'j')"
end

5 lies in (1..10)
c lies in ('a'..'j')