Ruby语法笔记

2024-03-22 00:14:03 345

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

ifa<b
puts'1'
elsifb<a
puts'2'
end

类

classClassname
deffunctionname(params)
putsparams
end
end

class1=Classname.new
class1.functionname('1')
unless
unlessfalse
print'ok'
else
print'no'
end

是否包含字符

print'puts'

user_input=gets.chomp

user_input.downcase!

ifuser_input.include?"s"
print'hass'
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

whilecounter<11
putscounter
counter=counter+1
end

Until

counter=1
untilcounter>10
printcounter
counter=counter+1
end

+=、-=、*=、/=
Somelanguageshavetheincrementoperators++and--(whichalsoaddorsubtract1fromavalue),butRubydoesnot
for循环
#如果1...10包含1-9，如果1..10包含1-10

fornumin1...10
putsnum
end

LoopMethod
AniteratorisjustaRubymethodthatrepeatedlyinvokesablockofcode.

i=20
loopdo
i-=1
print"#{i}"
breakifi<=0
end

i=20
loopdo
i-=1
nextifi%2!=0
print"#{i}"
breakifi<=0
end

数组

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

The.eachIterator迭代器

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

#onewaytoloop
numbers.each{|item|putsitem}

#anotherwaytoloop
numbers.eachdo|item|
putsitem
end

The.timesIterator次数迭代器

10.times{print'ok'})

Loopingwith'While'

num=1

whilenum<=50do
printnum
num+=1
end

Loopingwith'Until'

num=1
untilnum>50do
printnum
num+=1
end

LooptheLoopwithLoop

num=0

loopdo
num+=1
print"Ruby!"
breakifnum==30
end

The.splitMethod,

text.split(",")

puts"Texttosearchthrough:"
text=gets.chomp
puts"Wordtoredact"
redact=gets.chomp

words=text.split("")

words.eachdo|word|
printword
end

Ruby语法笔记

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