irb(main):003:0> 3.times {print "Ruby! "}
Ruby! Ruby! Ruby! => 3
irb(main):004:0> 1.upto(9) {|x| print x}
123456789=> 1
irb(main):005:0> a=[3,2,1]
=> [3, 2, 1]
irb(main):006:0> a[3]
=> nil
irb(main):007:0> a[3]=a[2]-1
=> 0
irb(main):008:0> a.each do |elt|
irb(main):009:1* print elt+1
irb(main):010:1> end
4321=> [3, 2, 1, 0]
irb(main):011:0> a=[1,2,3,4]
=> [1, 2, 3, 4]
irb(main):012:0> b=a.map{|x| x*x}
=> [1, 4, 9, 16]
irb(main):013:0> c=a.select{|x| x%2==0}
=> [2, 4]
irb(main):014:0> a.inject do |sum,x|
irb(main):015:1* sum + x
irb(main):016:1> end
=> 10
irb(main):017:0> h={
irb(main):018:1* :one=>1,
irb(main):019:1* :two=>2
irb(main):020:1> }
=> {:one=>1, :two=>2}
irb(main):021:0> h[:one]
=> 1
irb(main):022:0> h[:three]=3
=> 3
irb(main):023:0> h.each do |key,value|
irb(main):024:1* print "#{value}:#{key}; "
irb(main):025:1> end
1:one; 2:two; 3:three; => {:one=>1, :two=>2, :three=>3}
irb(main):026:0> File.open("d:/1.txt") do |f|
irb(main):027:1* line=f.readline
irb(main):028:1> end
=> "aaa\n"
irb(main):029:0> t=Thread.new do
irb(main):030:1* File.read("d:/1.txt")
irb(main):031:1> end
=> #<Thread:0x22d67f0 run>
irb(main):032:0>
