formingform
How to filter a list of maps by multi keys?
Hello!
I’m trying to filter list of maps to remove items where value of key was declared previously in this list. List that I have:
list = [
%{name: "01", type: "t_01", desc: "desc_01_1"},
%{name: "02", type: "t_02", desc: "desc_02_1"},
%{name: "01", type: "t_01", desc: "desc_01_2"},
%{name: "02", type: "t_02", desc: "desc_02_2"}
]
List what I want to get, it should filter by two keys: name and type
list = [
%{name: "01", type: "t_01", desc: "desc_01_1"},
%{name: "02", type: "t_02", desc: "desc_02_1"},
]
Marked As Solved
roflbobl
You can do that with Enum.uniq_by/2 like this
iex> list = [
%{name: "01", type: "t_01", desc: "desc_01_1"},
%{name: "02", type: "t_02", desc: "desc_02_1"},
%{name: "01", type: "t_01", desc: "desc_01_2"},
%{name: "02", type: "t_02", desc: "desc_02_2"}
]
iex> ist = Enum.uniq_by(list, fn elem -> {elem.name, elem.type} end)
iex> [
%{name: "01", type: "t_01", desc: "desc_01_1"},
%{name: "02", type: "t_02", desc: "desc_02_1"},
]
You can read more about the function here: Enum.uniq_by/2
4
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