| { | |
| "task_id": "performance_medium_2", | |
| "task_name": "Inefficient String Concatenation", | |
| "description": "Find the performance issue with string concatenation in a loop", | |
| "difficulty": "medium", | |
| "code_diff": "def build_string(items):\n result = \"\"\n for item in items:\n result = result + item + \",\"\n return result[:-1]", | |
| "expected_issues": [ | |
| { | |
| "line": 4, | |
| "type": "performance", | |
| "severity": "medium", | |
| "description": "Inefficient string concatenation in loop" | |
| } | |
| ] | |
| } |