Function rowFromString

Converts a string into a Row.

Tries to convert a string representation of a row into a row on a particular stage. If any bells are missing from the input string then these will be added in order at the end of the row. An exception is thrown if:

• The input string is too long for the stage
• A character is repeated in the input string
• A character doesn't represent a bell on the current stage

> Pricker.rowFromString('2143', Pricker.Stage.Minimus);
[2, 1, 4, 3]
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