David McHealy

David McHealy has asked 28 questions and find answers to 8 problems.

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David McHealy questions

Why do relationships as a concept exist in neo4j or graph databases in general?
Join two consumers into a single consumer that returns multiple values?
Adding type signature to where statement causes error I don't understand
In aeson, how do you encode from a Value without resulting in scientific notation?
How to turn a pull based pipe into a push based one?
How to update a map but only when key already exists
Type annotation in a pattern match in Rust?
How do you use parsec in a greedy fashion?
Could not deduce KnownNat in two existentials with respect to the singletons library
I can't seem to figure out type variables mixed with classes

David McHealy answers

Could not deduce KnownNat in two existentials with respect to the singletons library
Link to a static file from Hamlet
Lens package with algebraic types
How to convert from happs -> happstack?
How to read Yesod error messages effectively?
Unit testing IO actions with Hspec