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Dict.update works with a Result #208

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Sep 26, 2024
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Dict.update works with a Result #208

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Dict.update works with a Result
stuarth Sep 20, 2024
a28758a
Update flake.lock
Anton-4 Sep 26, 2024
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6 changes: 3 additions & 3 deletions examples/BasicDict/BasicDict.roc
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Original file line number Diff line number Diff line change
Expand Up @@ -48,13 +48,13 @@ expect

# We need to account for the case when a key (=fruit) is not in the Dict.
# So we need a function like this:
addFruit : [Present U64, Missing] -> [Present U64, Missing]
addFruit : Result U64 [Missing] -> Result U64 [Missing]
addFruit = \valueTag ->
when valueTag is
# If the fruit is not in the dict (=missing), we set the count to 1
Missing -> Present 1
Err Missing -> Ok 1
# If the fruit is in the dict (=present), we increase the count
Present count -> Present (count + 1)
Ok count -> Ok (count + 1)

Dict.get updatedDict "Apple" == (Ok 4)

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18 changes: 9 additions & 9 deletions flake.lock
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