How can we convert list of list to map ? (Elixir) - data-structures

Question

I have a list which consists of [A, B, C, D, E] and A has a list of values [1, 2, 3, 4, 5] similarly B has a list of values [1, 2, 3, 4, 5]
Date,SKU,Unit Price,Quantity,Total Price
2019-01-01,Death by Chocolate,180,5,900
2019-01-01,Cake Fudge,150,1,150
2019-01-01,Cake Fudge,150,1,150
2019-01-01,Cake Fudge,150,3,450
2019-01-01,Death by Chocolate,180,1,180
2019-01-01,Vanilla Double Scoop,80,3,240
2019-01-01,Butterscotch Single Scoop,60,5,300
2019-01-01,Vanilla Single Scoop,50,5,250
2019-01-01,Cake Fudge,150,5,750
Something like this but what I want is to create a map where the header is equal to values corresponding to it.
The expected output looks something like this:-
[%{date: '2019-01-01',SKU: 'Death by Chocolate', price: 50, quantity: 3},
%{date: '2019-01-01',SKU: 'Cake Fudge', price: 150, quantity: 3}]
I'm having a difficulty converting something like this.

Answer 1

For your specific use case a CSV parser will do what you're looking for, even if your file extension isn't .csv.
If you're just looking to use one list as keys for other lists, you can combine Enum.zip/2 with Map.new/1 to zip your header list with a row list and create a map (depending on file size you may want to work with streams instead of lists).
iex> [headers | rows] = do_some_parsing(text)
iex> headers
["Date", "SKU", "Unit Price", "Quantity", "Total Price"]
iex> rows
[["2019-01-01", "Death by Chocolate", 180, 5, 900],
["2019-01-01", "Cake Fudge", 150, 1, 150],
...]
iex> Enum.map(rows, fn row -> headers |> Enum.zip(row) |> Map.new() end)
[%{"Date" => "2019-01-01", "SKU" => "Death by Chocolate", "Unit Price" => 180, "Quantity" => 5, "Total Price" => 900},
%{"Date" => "2019-01-01", "SKU" => "Cake Fudge", "Unit Price" => 150, "Quantity" => 1, "Total Price" => 150},
...]