Ruby语法笔记_Ruby

Ruby语法笔记

2020-05-07 11:02脚本之家 Ruby

本文给大家记录的是本人学习ruby之后所记录下来的部分语法知识，分享给有需要的小伙伴，希望对大家能够有所帮助。

接受用户输入

1	`first_name = gets.chomp`

首字母大写

1	`first_name.capitalize!`

字母变大写

1	`first_name.upcase!`

字母变小写

1	`first_name.downcase!`

多行输出

									print <<EOF

									  # 多行输出

									EOF

注释

# 我是注释

变量获取

1	`#{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?"s"

									  print 'has s'

									end

替换字符

1 2	`# s -> th` `user_input.gsub!(/s/,"th")`

在字符串中输出变量值

1	`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

									i = 20

									loop do

									 i -= 1

									 next if i%2 != 0

									 print "#{i}"

									 break if i <= 0

									end

数组

1	`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

1	`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