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# Reverses the order of the elements of something that is iterable and optionally runs a # [lambda](https://puppet.com/docs/puppet/latest/lang_lambdas.html) for each # element. # # This function takes one to two arguments: # # 1. An `Iterable` that the function will iterate over. # 2. An optional lambda, which the function calls for each element in the first argument. It must # request one parameter. # # @example Using the `reverse_each` function # # ```puppet # $data.reverse_each |$parameter| { <PUPPET CODE BLOCK> } # ``` # # or # # ```puppet # $reverse_data = $data.reverse_each # ``` # # or # # ```puppet # reverse_each($data) |$parameter| { <PUPPET CODE BLOCK> } # ``` # # or # # ```puppet # $reverse_data = reverse_each($data) # ``` # # When no second argument is present, Puppet returns an `Iterable` that represents the reverse # order of its first argument. This allows methods on `Iterable` to be chained. # # When a lambda is given as the second argument, Puppet iterates the first argument in reverse # order and passes each value in turn to the lambda, then returns `undef`. # # @example Using the `reverse_each` function with an array and a one-parameter lambda # # ```puppet # # Puppet will log a notice for each of the three items # # in $data in reverse order. # $data = [1,2,3] # $data.reverse_each |$item| { notice($item) } # ``` # # When no second argument is present, Puppet returns a new `Iterable` which allows it to # be directly chained into another function that takes an `Iterable` as an argument. # # @example Using the `reverse_each` function chained with a `map` function. # # ```puppet # # For the array $data, return an array containing each # # value multiplied by 10 in reverse order # $data = [1,2,3] # $transformed_data = $data.reverse_each.map |$item| { $item * 10 } # # $transformed_data is set to [30,20,10] # ``` # # @example Using `reverse_each` function chained with a `map` in alternative syntax # # ```puppet # # For the array $data, return an array containing each # # value multiplied by 10 in reverse order # $data = [1,2,3] # $transformed_data = map(reverse_each($data)) |$item| { $item * 10 } # # $transformed_data is set to [30,20,10] # ``` # # @since 4.4.0 # Puppet::Functions.create_function(:reverse_each) do dispatch :reverse_each do param 'Iterable', :iterable end dispatch :reverse_each_block do param 'Iterable', :iterable block_param 'Callable[1,1]', :block end def reverse_each(iterable) # produces an Iterable Puppet::Pops::Types::Iterable.asserted_iterable(self, iterable, true).reverse_each end def reverse_each_block(iterable, &block) Puppet::Pops::Types::Iterable.asserted_iterable(self, iterable).reverse_each(&block) nil end end