original program submitted June 7th: https://github.com/mk30/codingexercise/tree/68ab978a13b736974454ab5013263907aab8ca2f
the latest commit includes a refactored version of the original program that now deals with strings instead of arrays, processes the numbers across instead of down, and parses underscore-and-pipe numbers into digits via an object that has underscore-and-pipe numbers as keys and digits as values (previously each underscore-and-pipe number passed through a series of if-else comparison statements).
to run: node parser.js test.txt
to do:
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part 2: plug each digit of account number into checksum formula. if the outcome of the formula is anything but 0, return "invalid."
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part 3: format account number output so that each account number is on its own line. run incoming account numbers through a regex that checks for presence of question marks. if an account number returns a match for one or more question marks, add 'ILL' to end of the line. run the remaining account numbers through the checksum formula and if an account number fails, add 'ERR' to end of the line.
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part 4: still thinking.