Useful Enum functions

functions_test.ex

final_val  = Enum.reduce([10, 22, 84], 0, fn(x, acc) -> x + acc end)
# acc takes the value of the return of function passed to Enum.reduce
# `here fn(x,acc) -> x + acc` is the function
# 1 
# fn(10, 0)  returns 10
# 2 
# fn(22, 10) returns 32
# 3 
# fn(84, 32) returns 116

# https://hexdocs.pm/elixir/Enum.html#reduce/2

map_function.ex

new_list =  Enum.map([7, 2, 4], fn x -> x * 2 end)
# each element of the list/iterator is replaced with the return of the function

# in place of 7, x*2 = 14 is placed
# in place of 2, x*2 = 4 is placed
# in place of 8, x*2 = 8 is placed


# https://hexdocs.pm/elixir/Enum.html#map/2