Ruby中一些基本语法知识点的罗列汇总

#!/usr/bin/ruby -w

puts "Hello, Ruby!";

$ ruby test.rb

Hello, Ruby!

a + b is interpreted as a+b ( Here a is a local variable)
a +b is interpreted as a(+b) ( Here a is a method call)

#!/usr/bin/ruby -w

print <<EOF
  This is the first way of creating
  here document ie. multiple line string.
EOF

print <<"EOF";        # same as above
  This is the second way of creating
  here document ie. multiple line string.
EOF

print <<`EOC`         # execute commands
 echo hi there
 echo lo there
EOC

print <<"foo", <<"bar" # you can stack them
 I said foo.
foo
 I said bar.
bar

  This is the first way of creating
  her document ie. multiple line string.
  This is the second way of creating
  her document ie. multiple line string.
hi there
lo there
    I said foo.
    I said bar.

BEGIN {
  code
}

#!/usr/bin/ruby

puts "This is main Ruby Program"

BEGIN {
  puts "Initializing Ruby Program"
}

Initializing Ruby Program
This is main Ruby Program

END {
  code
}

#!/usr/bin/ruby

puts "This is main Ruby Program"

END {
  puts "Terminating Ruby Program"
}
BEGIN {
  puts "Initializing Ruby Program"
}

Initializing Ruby Program
This is main Ruby Program
Terminating Ruby Program

# This is a comment.
# This is a comment, too.
# This is a comment, too.
# I said that already.

=begin
This is a comment.
This is a comment, too.
This is a comment, too.
I said that already.
=end