Code reviewMediumcr-g048

Subject Boundary conditionsLevel Mid–Senior~20 minCommon in Databases & SQL · Algorithms & data structures interviewsIndustries Software development

Question

Review this Java method that returns the file extension (without the dot), or empty string if none.

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.

Learn the concepts

Talk through your review

Code to reviewjava

1String extension(String filename) {2    int dot = filename.lastIndexOf('.');3    return filename.substring(dot + 1);4}

Run or narrate your approach, then ask the coach.