Puppet Function: flatten

Defined in:
puppet/modules/stdlib/lib/puppet/parser/functions/flatten.rb
Function type:
Ruby 3.x API

Overview

flatten() ⇒ Any

This function flattens any deeply nested arrays and returns a single flat array as a result.

Examples:

flatten(['a', ['b', ['c']]])

Would return: ['a','b','c']

Returns:

  • (Any) 


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# File 'puppet/modules/stdlib/lib/puppet/parser/functions/flatten.rb', line 6

newfunction(:flatten, :type => :rvalue, :doc => <<-EOS
This function flattens any deeply nested arrays and returns a single flat array
as a result.

*Examples:*

  flatten(['a', ['b', ['c']]])

Would return: ['a','b','c']
  EOS
) do |arguments|

  raise(Puppet::ParseError, "flatten(): Wrong number of arguments " +
    "given (#{arguments.size} for 1)") if arguments.size != 1

  array = arguments[0]

  unless array.is_a?(Array)
    raise(Puppet::ParseError, 'flatten(): Requires array to work with')
  end

  result = array.flatten

  return result
end