Samuel-88
Update all values in a map using values from another map
How can I update all values in a map, using the values from corresponding keys of another map? For example I have the two maps bellow:
map = %{"December 2021" => 0, "November 2021" => 0, "October 2021" => 0}
map_2 = %{"December 2021" => 7, "November 2021" => 6}
And I want to update all values from map with the corresponding values from map_2, so in the end:
map = %{"December 2021" => 7, "November 2021" => 6, "October 2021" => 0}
I have tried:
Enum.map(map_2, fn {key, value} -> %{map | k => v} end)
I have also tried the code above with other functions like Map.update!/3 and similar ones, but they all return a list with maps for each iteration of Enum.map.
Does someone have any idea on how to do it?
Thanks a lot in advance!
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First 10 of 11 Posts
axelson
Try using
Map.new/2, in the function you pass as the second argument you should return the key and value as a tuple.eksperimental
Map.merge/2-3?eksperimental
You need
Enum.into(map2, map1, your_merge_function)kokolegorille
As mentionned by @eksperimental … Map.merge could solve this.
ityonemo
kokolegorille
Oh, your solution is not the same, but strictly correspond to the title
ityonemo
Plus it is very legible
eksperimental
It is as simple as:
Map.merge(map, map_2)kokolegorille
It is not the same as the solution proposed by @ityonemo
It depends what to do with keys in map_2, not present in map
Samuel-88
Great solution! Thanks a lot. I don’t know how I haven’t seen that.