回答編集履歴
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もっと簡潔に
answer
CHANGED
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@@ -2,8 +2,8 @@
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2
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```
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[["a",10],["b",20],["c",30],["a",40],["a",50]]
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-
|> group-by (
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|> group-by (.0)
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|> Obj.map
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|> Obj.map -> it |> map (.1) |> fold1 (+)
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|> obj-to-pairs
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# [["a",100],["b",20],["c",30]]
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