茴香豆有幾種寫法之 Loop

jprovim — Fri, 13 Feb 2015 15:26:44 +0800

Loop

loop

number = 0
loop do
  break if number > 15
  puts "The number is #{number}"
  number += 1
end

until

until number > 30
  puts "The number is #{number}"
  number += 1
end

while

while number < 40 do
  puts "The number is #{number}"
  number += 1
end

times

16.times do |number|
  puts "The number is #{number}"
end

each

list = [0, 1, 2, 3, 4]
list.each do |number|
  puts "The number inside the loop is #{number}"
end

each without initializing list

(0..15).each do |number|
  puts "The number inside the loop is #{number}"
end

for another form

for number in 0..15
  puts "The number inside the loop is #{number}"
end

請牛人現身，繼續增加方法！

jprovim — Fri, 13 Feb 2015 15:12:35 +0800

已知

a = [1,2,3]
b = [4,5,6] # or b = [4,5,6, [7,8,9]]

insert

a[a.length, 0] = b
a[a.length..0] = b
a.insert(a.length, *b)

6的變形

a = [1,2,3]
c = [4,5,6]
a.each{|n| c = [n] | c }
# => [3, 2, 1, 4, 5, 6]

請牛人現身，繼續增加方法！