Puppet Function: flatten

Defined in:
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)


5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
# File 'modules/stdlib/lib/puppet/parser/functions/flatten.rb', line 5

newfunction(:flatten, :type => :rvalue, :doc => <<-DOC
  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']
DOC
           ) 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