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printerErrors.js
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printerErrors.js
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'use strict'
// Codewars - Andreas Sosilo
// 7 kyu - Printer Errors
/*
Task:
-----
In a factory a printer prints labels for boxes. For one kind of boxes the printer has
to use colors which, for the sake of simplicity, are named with letters from a to m.
The colors used by the printer are recorded in a control string. For example a "good"
control string would be aaabbbbhaijjjm meaning that the printer used three times color a,
four times color b, one time color h then one time color a...
Sometimes there are problems: lack of colors, technical malfunction and a "bad" control
string is produced e.g. aaaxbbbbyyhwawiwjjjwwm with letters not from a to m.
You have to write a function printer_error which given a string will output the error
rate of the printer as a string representing a rational whose numerator is the number of
errors and the denominator the length of the control string. Don't reduce this fraction
to a simpler expression.
The string has a length greater or equal to one and contains only letters from ato z.
#Examples:
s="aaabbbbhaijjjm"
error_printer(s) => "0/14"
s="aaaxbbbbyyhwawiwjjjwwm"
error_printer(s) => "8/22"
*/
function printerError (s) {
const arr = s.match(/[n-z]/gi)
return `${(arr === null) ? 0 : arr.length}/${s.length}`
}
// TEST CASES
const s = 'aaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbmmmmmmmmmmmmmmmmmmmxyz'
console.log(printerError(s)) // '3/56'