Demo how to use Enum.reduce in elixir

MyReduce.ex

1>Find the max number of a list
2>Remove some elements of a Map
3>Remove some elements of a List
4>Map/reduce

defmodule MyReduce do
  @moduledoc false
  def max_number_of_list(list) do
    Enum.reduce list,List.first(list),fn(x,acc) ->
      if(x > acc) do
        acc = x
      else
        acc = acc
      end
    end
  end

  def remove_minus_of_list(list) do
    Enum.reduce list, [], fn(x,acc) ->
          if (x>=0), do: [x | acc], else: acc
    end
  end
  def remove_ele_from_map(map,value) do
    Enum.reduce map, map, fn
      ({k,v},acc) when value == v -> Map.delete(acc,k)
      (_,acc) -> acc
      end
  end
  
  end