接受用户输入
首字母大写
字母变大写
字母变小写
多行输出
注释
变量获取
变量
- 全局变量 $
- 类变量 @@
- 方法变量 @
- 局部变量 小写字母或_
if/else
if a b
puts '1'
elsif b a
puts '2'
end
类
class Classname
def functionname(params)
puts params
end
end
class1 = Classname.new
class1.functionname('1')
unless
unless false
print 'ok'
else
print 'no'
end
是否包含字符
print 'puts'
user_input = gets.chomp
user_input.downcase!
if user_input.include?"s"
print 'has s'
end
替换字符
# s -> th
user_input.gsub!(/s/,"th")
在字符串中输出变量值
puts 'okok #{user_input}'
while
counter = 1
while counter 11
puts counter
counter = counter + 1
end
Until
counter = 1
until counter > 10
print counter
counter = counter + 1
end
+= 、 -= 、 *=、 /=
Some languages have the increment operators ++ and -- (which also add or subtract 1 from a value), but Ruby does not
for循环
# 如果 1...10 包含1-9，如果 1..10 包含1-10
for num in 1...10
puts num
end
Loop Method
An iterator is just a Ruby method that repeatedly invokes a block of code.
i = 20
loop do
i -= 1
print "#{ i }"
break if i = 0
end
Next
i = 20
loop do
i -= 1
next if i%2 != 0
print "#{i}"
break if i = 0
end
数组
The .each Iterator迭代器
numbers = [1, 2, 3, 4, 5]
# one way to loop
numbers.each { |item| puts item }
# another way to loop
numbers.each do |item|
puts item
end
The .times Iterator 次数迭代器
Looping with 'While'
num = 1
while num = 50 do
print num
num += 1
end
Looping with 'Until'
num = 1
until num > 50 do
print num
num += 1
end
Loop the Loop with Loop
num = 0
loop do
num += 1
print "Ruby!"
break if num == 30
end
The .split Method,
text.split(",")
puts "Text to search through: "
text = gets.chomp
puts "Word to redact"
redact = gets.chomp
words = text.split(" ")
words.each do |word|
print word
end
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