Returns a shallow copy of this object.

Because Value is a value type, this method returns self, which already involves a shallow copy of this object because value types are passed by value.

Must yield this collection's elements to the block.

Returns true if self is empty, false otherwise.

([] of Int32).empty? # => true
([1]).empty?         # => false

Returns if among the headers for key there is some that contains word as a value. The word is expected to match between word boundaries (i.e. non-alphanumeric chars).

require "http/headers"

headers = HTTP::Headers{"Connection" => "keep-alive, Upgrade"}
headers.includes_word?("Connection", "Upgrade") # => true

Appends this struct's name and instance variables names and values to the given IO.

struct Point
  def initialize(@x : Int32, @y : Int32)
  end
end

p1 = Point.new 1, 2
p1.to_s    # "Point(@x=1, @y=2)"
p1.inspect # "Point(@x=1, @y=2)"

Same as #inspect(io).