鬱悶壞了, 寫了三個小時的ruby筆記居然在提交時丟失了.
只好重新寫一點兒還想得起的.
函式def say_goodnight(name)
result = "good night " + name
return result
end#time for bed...
puts say_goodnight("olojiang")
puts say_goodnight("yy")
執行ruby filename
或ruby
puts "hello world"
ctrl + d
riri -c
ri gc
ri gc::start
ri gc.start
ri --help
irbirb(main):001:0> "asdfl;kjsdfsdf".length
=> 14
irb(main):002:0> "risk".index("c")
=> nil
irb(main):003:0> "risk".index("s")
=> 2
irb(main):004:0> -192.abs
=> 192
irb(main):005:0> exit
#function
def say_goodnight(name)
result = "good night " + name
return result
enddef say_goodnight2(name)
"good night, #"
end#call method
puts
puts "************* call method"
puts say_goodnight("olojiang")
puts say_goodnight("yy")
puts(say_goodnight("jw"))
puts("and good night!/ngrandma")
#in a string #
puts
puts "************* in a string #"
puts(say_goodnight2("yjl"))
puts(say_goodnight2("jw"))
#variable
puts
puts "************* variable"
$greeting = "hello"
@name = "procedure"
puts("#$greeting #@name")
#array
puts
puts "************* array"
a = [1, "test string", 234.3]
puts a[2]
a[0] = nil
puts a
a = ['ant', 'cat']
puts a
a = %w[x y z]
puts a
#hash
puts
puts "************* hash"
hash_table =
puts hash_table["key1"]
puts hash_table["key2"]
puts hash_table[3][1]
hash_table2 = hash.new(999)
puts("default hash value: #")
#ifputs
puts "************* if"
count = 10
if count>0
count -=5
puts count
endcount -= 10 if count>= 5
puts count
#while
puts
puts "************* while"
count = 11
while(count>0)
count -=5
puts count
endnum = 2
num = num*num while num<1000
puts(num)
#regular expression
puts
puts "************* regular expression"
puts "hasdfsdf" =~ /f./
puts "hasdfsdf" =~ /df.*f/
line = "perl is good, python is nice"
puts(line.sub(/perl/, "ruby"))
puts(line.gsub(/perl|python/, "ruby"))
#block
puts
puts "************* block"
def greet
puts "start method"
yield("greet")
yield("greet")
puts "end method"
end
greet " }
puts
greet do
|method_name|
puts "multi line"
puts "block"
puts "method name is: #"
end#for each and block
puts
puts "************** for each and block"
['cat', 'dog', 'horse'].each
puts
5.times
puts
3.upto(6)
puts
('a'..'e').each
puts
#printf
puts
puts "************** printf"
printf("number: %5.2f /nstring: %s/n", 23.234, "hello")
#gets
puts
puts "************** gets"
print "input: "
line = gets
puts line
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