pattern-detectionlisted

# Pattern Detection ## When to use this skill - **Code review**: Proactively detect problematic patterns - **Security review**: Scan for vulnerability patterns - **Refactoring**: Identify duplicate code - **Monitoring**: Alert on anomalies ## Instructions ### Step 1: Detect code smell patterns **Detect long functions**: ```bash # Find functions with 50+ lines grep -n "function\|def\|func " **/*.{js,ts,py,go} | \ while read line; do file=$(echo $line | cut -d: -f1) linenum=$(echo $line | cut -d: -f2) # Function length calculation logic done ``` **Duplicate code patterns**: ```bash # Search for similar code blocks grep -rn "if.*==.*null" --include="*.ts" . grep -rn "try\s*{" --include="*.java" . | wc -l ``` **Magic numbers**: ```bash # Search for hard-coded numbers grep -rn "[^a-zA-Z][0-9]{2,}[^a-zA-Z]" --include="*.{js,ts}" . ``` ### Step 2: Security vulnerability patterns **SQL Injection risks**: ```bash # SQL query built via string concatenation grep -rn "query.*+.*\$\|execute.*%s\|query.*f\"" --include="*.py" . grep -rn "SELECT.*\+.*\|\|" --include="*.{js,ts}" . ``` **Hard-coded secrets**: ```bash # Password, API key patterns grep -riE "(password|secret|api_key|apikey)\s*=\s*['\"][^'\"]+['\"]" --include="*.{js,ts,py,java}" . # AWS key patterns grep -rE "AKIA[0-9A-Z]{16}" . ``` **Dangerous function usage**: ```bash # eval, exec usage grep -rn "eval\(.*\)\|exec\(.*\)" --include="*.{py,js}" . # innerHTML usage grep -rn "innerHTML\s*=" --include="*