Pattern recompiled per line
Review this Java method that masks card-like numbers in each log line. It runs on millions of lines per export.
What a strong answer looks like
Separate real bugs from style. Rank issues by severity, point at the root cause rather than the symptom, and suggest a concrete fix, specific and kind.
0:00 of about 18 min
Mark a line and say what kind of problem it is.0 findings
1String maskLine(String line) {
2 Pattern p = Pattern.compile("\\b\\d{13,16}\\b");
3 return p.matcher(line).replaceAll("[REDACTED]");
4}
Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.
Run or narrate your approach, then ask the coach.