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Current Path : /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/functions/
Current File : //opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/functions/map.rb
# Applies a [lambda](https://puppet.com/docs/puppet/latest/lang_lambdas.html)
# to every value in a data structure and returns an array containing the results.
#
# This function takes two mandatory arguments, in this order:
#
# 1. An array, hash, or other iterable object that the function will iterate over.
# 2. A lambda, which the function calls for each element in the first argument. It can
# request one or two parameters.
#
# @example Using the `map` function
#
# `$transformed_data = $data.map |$parameter| { <PUPPET CODE BLOCK> }`
#
# or
#
# `$transformed_data = map($data) |$parameter| { <PUPPET CODE BLOCK> }`
#
# When the first argument (`$data` in the above example) is an array, Puppet passes each
# value in turn to the lambda.
#
# @example Using the `map` function with an array and a one-parameter lambda
#
# ```puppet
# # For the array $data, return an array containing each value multiplied by 10
# $data = [1,2,3]
# $transformed_data = $data.map |$items| { $items * 10 }
# # $transformed_data contains [10,20,30]
# ```
#
# When the first argument is a hash, Puppet passes each key and value pair to the lambda
# as an array in the form `[key, value]`.
#
# @example Using the `map` function with a hash and a one-parameter lambda
#
# ```puppet
# # For the hash $data, return an array containing the keys
# $data = {'a'=>1,'b'=>2,'c'=>3}
# $transformed_data = $data.map |$items| { $items[0] }
# # $transformed_data contains ['a','b','c']
# ```
#
# When the first argument is an array and the lambda has two parameters, Puppet passes the
# array's indexes (enumerated from 0) in the first parameter and its values in the second
# parameter.
#
# @example Using the `map` function with an array and a two-parameter lambda
#
# ```puppet
# # For the array $data, return an array containing the indexes
# $data = [1,2,3]
# $transformed_data = $data.map |$index,$value| { $index }
# # $transformed_data contains [0,1,2]
# ```
#
# When the first argument is a hash, Puppet passes its keys to the first parameter and its
# values to the second parameter.
#
# @example Using the `map` function with a hash and a two-parameter lambda
#
# ```puppet
# # For the hash $data, return an array containing each value
# $data = {'a'=>1,'b'=>2,'c'=>3}
# $transformed_data = $data.map |$key,$value| { $value }
# # $transformed_data contains [1,2,3]
# ```
#
# @since 4.0.0
#
Puppet::Functions.create_function(:map) do
  dispatch :map_Hash_2 do
    param 'Hash[Any, Any]', :hash
    block_param 'Callable[2,2]', :block
  end

  dispatch :map_Hash_1 do
    param 'Hash[Any, Any]', :hash
    block_param 'Callable[1,1]', :block
  end

  dispatch :map_Enumerable_2 do
    param 'Iterable', :enumerable
    block_param 'Callable[2,2]', :block
  end

  dispatch :map_Enumerable_1 do
    param 'Iterable', :enumerable
    block_param 'Callable[1,1]', :block
  end

  def map_Hash_1(hash)
    result = []
    begin
      hash.map {|x, y| result << yield([x, y]) }
    rescue StopIteration
    end
    result
  end

  def map_Hash_2(hash)
    result = []
    begin
      hash.map {|x, y| result << yield(x, y) }
    rescue StopIteration
    end
    result
  end

  def map_Enumerable_1(enumerable)
    result = []
    enum = Puppet::Pops::Types::Iterable.asserted_iterable(self, enumerable)
    begin
      loop { result << yield(enum.next) }
    rescue StopIteration
    end
    result
  end

  def map_Enumerable_2(enumerable)
    enum = Puppet::Pops::Types::Iterable.asserted_iterable(self, enumerable)
    if enum.hash_style?
      enum.map { |entry| yield(*entry) }
    else
      result = []
      begin
        index = 0
        loop do
          result << yield(index, enum.next)
          index = index + 1
        end
      rescue StopIteration
      end

      result
    end
  end
end
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