shahryarjb
How to edit and sort index of nested map in a list
Hello, I have a list like this:
[
%{
index: 1,
params: %{
id: "test1",
title: "test of one",
width: "col-sm-12"
},
type: "Heading"
},
%{
index: 3,
params: %{
id: "test3",
title: "test of one",
width: "col-sm-12"
},
type: "Heading"
},
%{
index: 5,
params: %{
id: "test5",
title: "test of one",
width: "col-sm-12"
},
type: "Heading"
},
]
and I want to change all index number and sort them but with new index which starts 0 like this
[
%{
index: 0,
params: %{
id: "test1",
title: "test of one",
width: "col-sm-12"
},
type: "Heading"
},
%{
index: 1,
params: %{
id: "test4",
title: "test of one",
width: "col-sm-12"
},
type: "Heading"
},
%{
index: 2,
params: %{
id: "test5",
title: "test of one",
width: "col-sm-12"
},
type: "Heading"
},
]
I need this because maybe a map is deleted in a list and the map deleted index will be null and I want to re-index all the map after every deleting
Thanks
Most Liked
chasers
If you wanted to use with_index you could do this but you’d be going through those more than you need to:
Enum.with_index(list) |> Enum.map(fn {x, index} -> Map.put(x, :index, index) end)
2
eksperimental
Here’s a one-liner.
Enum.reduce(list, {0, []}, fn element, {index, list_acc} -> {index + 1, [%{element | index: index} | list_acc]} end)
|> elem(1)
|> Enum.reverse()
2
benwilson512
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