require "vdf"

# Set up hash to generate a VDF from
object = {
	"string" => "string",
	"false" => false,
	"true" => true,
	"number" => 1234,
	"float" => 12.34,
	"null" => nil,
	"nested" => {
		"string" => "string",
		"deep" => {
			"string" => "string"
		}
	}
}

# Generate a VDF string and output it
puts VDF.generate(object)

If you're dealing with parsing large files, you should avoid loading them into memory completely. This library supports parsing a VDF file from a File object like this:

require "vdf"

# Open the file in read mode and parse it.
parsed = File.open("filename.vdf", "r") do |file|
	VDF.parse(file)
end

# Pretty-print the result
p parsed

      user       system     total     real
vdf    0.015000   0.000000   0.015000 (  0.013349)
vdf4r  0.391000   0.000000   0.391000 (  0.389993)

      user       system    total      real
vdf    1.312000   0.031000   1.343000 (  1.348015)
vdf4r 53.422000   0.016000  53.438000 ( 54.020029)