Range Operator for Base62 Encoding

Question

For base 62 encoding, I need all 62 alphanumeric characters. The F# range operator offers a nice shorthand for this.

let alphaNumericCharacters =
    seq {
        yield! [|'a'..'z'|]
        yield! [|'A'..'Z'|]
        yield! [|'0'..'9'|]
    } |> Array.ofSeq

This is nice and concise, but I'm greedy. Is there a way of doing this in one line?

Answer 1

let alphaNumericCharacters = Array.concat [| [|'0'..'9'|]; [|'A'..'Z'|]; [|'a'..'z'|] |]