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Code reviewMediumcr-g474
Subject Quadratic loopsLevel Mid–Senior~18 minCommon in Algorithms & data structures interviewsIndustries Software development

Question

Review this Java method that renders a CSV line-by-line.

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.

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Code to reviewjava
String renderCsv(List<String[]> rows) {    String out = "";    for (String[] row : rows) {        for (int i = 0; i < row.length; i++) {            out += row[i];            if (i < row.length - 1) out += ",";        }        out += "\n";    }    return out;}
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