接受用户输入

first_name = gets.chomp

首字母大写

first_name.capitalize!

字母变大写

first_name.upcase!

字母变小写

first_name.downcase!

多行输出

print <<EOF # 多行输出 EOF

注释

# 我是注释

变量获取

#{first_name}

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" 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

my_array = [1,2,3,4,5]

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

10.times { print 'ok'})

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