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Clarice Bouwer
Clarice Bouwer

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How to create a string from values joining with commas and an and.

#clojure #webdev

I have a vector of errors that looks like this:

(def messages [{:error "Name is required"} {:error "Last name is required"} {:error "Date of birth is in the wrong format"}])
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(->> messages (map :error) (remove string/blank?) (string/join ", ") (#(string/replace % #", ([^,]+)$" " and $1")))
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The above form will output the following result:

"Name is required, Last name is required and Date of birth is in the wrong format"
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It uses a threaded macro to map through all :error keywords, removing blanks (and nils), joining by comma and then replacing the last comma with an and to read nicely.

This gives me a comma-separated list

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