Puppet Function: concat

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

Overview

concat()Array

> Note:

Since Puppet 4.0, you can use the `+`` operator for concatenation of arrays and
merge of hashes, and the `<<`` operator for appending:

`['1','2','3'] + ['4','5','6'] + ['7','8','9']` returns `['1','2','3','4','5','6','7','8','9']` `[1, 2, 3] << 4` returns `[1, 2, 3, 4]` `[1, 2, 3] << [4, 5]` returns `[1, 2, 3, [4, 5]]`

Examples:

Example usage


concat(['1','2','3'],'4') returns ['1','2','3','4']
concat(['1','2','3'],'4',['5','6','7']) returns ['1','2','3','4','5','6','7']

Returns:

  • (Array)

    The single concatenated array



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# File 'modules/stdlib/lib/puppet/parser/functions/concat.rb', line 5

newfunction(:concat, :type => :rvalue, :doc => <<-DOC
  @summary
    Appends the contents of multiple arrays into array 1.

  @example Example usage

    concat(['1','2','3'],'4') returns ['1','2','3','4']
    concat(['1','2','3'],'4',['5','6','7']) returns ['1','2','3','4','5','6','7']

  > *Note:*
    Since Puppet 4.0, you can use the `+`` operator for concatenation of arrays and
    merge of hashes, and the `<<`` operator for appending:

  `['1','2','3'] + ['4','5','6'] + ['7','8','9']` returns `['1','2','3','4','5','6','7','8','9']`
  `[1, 2, 3] << 4` returns `[1, 2, 3, 4]`
  `[1, 2, 3] << [4, 5]` returns `[1, 2, 3, [4, 5]]`

  @return [Array] The single concatenated array
DOC
           ) do |arguments|

  # Check that more than 2 arguments have been given ...
  raise(Puppet::ParseError, "concat(): Wrong number of arguments given (#{arguments.size} for < 2)") if arguments.size < 2

  a = arguments[0]

  # Check that the first parameter is an array
  unless a.is_a?(Array)
    raise(Puppet::ParseError, 'concat(): Requires array to work with')
  end

  result = a
  arguments.shift

  arguments.each do |x|
    result += (x.is_a?(Array) ? x : [x])
  end

  return result
end