Ruby/Language Basics/Interpolating
Материал из Wiki.crossplatform.ru
Add extra # sign to interpolation
number = 5 puts "We"re ##{number}!" # => "We"re #5!"
Call integer.to_s and Interpolation
x = 10 y = 20 puts x.to_s + " + " + y.to_s + " = " + (x + y).to_s puts "#{x} + #{y} = #{x + y}"
Compare string after interpolation
number = 5 "#{number}" == "5" # => true
Constant Interpolation
puts "It"s a #{"bad " * 5}world"
Do a calculation in interpolation block
"I"ve set x to #{x = 5; x += 1}." # => "I"ve set x to 6." x # => 6
Escape theinterpolation string
"\#{foo}" # => "\#{foo}" "#{foo}" # => "\#{foo}"
Interpolating Variables in Double-Quoted Strings
temperature = 36 puts "The temperature is " + String(temperature) + "." puts "The temperature is #{temperature}."
Interpolation
x = 10 y = 20 puts "#{x} + #{y} = #{x + y}" 10 + 20 = 30
Interpolation in Here document
name = "Mr. Lorum" email = <<END Dear #{name}, END
Number value Interpolation
temperature = 36 puts "The temperature is #{temperature}." temperature = temperature + 5 puts "Now the temperature is #{temperature}."
Put class into interpolation block
%{Here is #{class InstantClass def bar "some text" end end InstantClass.new.bar }.}
The #{ interpolates the result ofnto the string at that position
puts "100 * 5 = #{100 * 5}"
Use string method in interpolation
text = "this is a test" puts "Split method: #{text.split.length}"
Using expression substitution
# you can grab an argument off the command line and add it to the output. #!/usr/bin/env ruby puts "Hello, #{ARGV[0]}!"
You can interpolate strings too
x = "cat" puts "The #{x} in the hat"
