faq.md

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FAQ

Where my puts output goes?

By default, puts output goes to STDOUT which is a JavaScript console.log function. You can override it by setting $stdout to a Ruby object which has write method.

$stdout = Object.new.tap do |obj|
  def obj.write(str)
    JS.global[:document].write(str)
  end
end

puts "Hello, world!" # => Prints "Hello, world!" to the HTML document

How to run WebAssembly in Ruby

Use wasmtime Ruby gem.