ts-02-groupby
0.000
Proposed solution
```ts export function groupBy<T, K extends string | number>( items: T[], keyFn: (item: T) => K, ): Record<K, T[]> ```
Test output (stdout)
TAP version 13
# /tmp/llmlab-ts-02-groupby-1tl7hzmh/solution.test.ts:3
# import { groupBy } from "./solution.ts";
# ^
# SyntaxError: The requested module './solution.ts' does not provide an export named 'groupBy'
# at \#asyncInstantiate (node:internal/modules/esm/module_job:327:21)
# at async ModuleJob.run (node:internal/modules/esm/module_job:431:5)
# at async node:internal/modules/esm/loader:633:26
# at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:101:5)
# Node.js v24.16.0
# Subtest: solution.test.ts
not ok 1 - solution.test.ts
---
duration_ms: 63.457695
type: 'test'
location: '/tmp/llmlab-ts-02-groupby-1tl7hzmh/solution.test.ts:1:1'
failureType: 'testCodeFailure'
exitCode: 1
signal: ~
error: 'test failed'
code: 'ERR_TEST_FAILURE'
...
1..1
# tests 1
# suites 0
# pass 0
# fail 1
# cancelled 0
# skipped 0
# todo 0
# duration_ms 67.366756
Self-repair attempts
[
{
"total": 1,
"answer": "```ts\nexport function groupBy<T, K extends string | number>(\n items: T[],\n keyFn: (item: T) => K,\n): Record<K, T[]>\n```",
"passed": 0,
"test_error": "TAP version 13\n# /tmp/llmlab-ts-02-groupby-1tl7hzmh/solution.test.ts:3\n# import { groupBy } from \"./solution.ts\";\n# ^\n# SyntaxError: The requested module './solution.ts' does not provide an export named 'groupBy'\n# at \\#asyncInstantiate (node:internal/modules/esm/module_job:327:21)\n# at async ModuleJob.run (node:internal/modules/esm/module_job:431:5)\n# at async node:internal/modules/esm/loader:633:26\n# at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:101:5)\n# Node.js v24.16.0\n# Subtest: solution.test.ts\nnot ok 1 - solution.test.ts\n ---\n duration_ms: 63.457695\n type: 'test'\n location: '/tmp/llmlab-ts-02-groupby-1tl7hzmh/solution.test.ts:1:1'\n failureType: 'testCodeFailure'\n exitCode: 1\n signal: ~\n error: 'test failed'\n code: 'ERR_TEST_FAILURE'\n ...\n1..1\n# tests 1\n# suites 0\n# pass 0\n# fail 1\n# cancelled 0\n# skipped 0\n# todo 0\n# duration_ms 67.366756"
},
{
"total": 6,
"answer": "```ts\nexport function groupBy<T, K extends string | number>(\n items: T[],\n keyFn: (item: T) => K,\n): Record<K, T[]> {\n return items.reduce((acc, item) => {\n const key = keyFn(item);\n if (!acc[key]) {\n acc[key] = [];\n }\n acc[key].push(item);\n return acc;\n }, {} as Record<K, T[]>);\n}\n```",
"passed": 6,
"test_error": ""
}
]System prompt
You are an expert programmer. Solve the task exactly as specified. Output your solution as fenced code blocks using the required file name(s) and the exact function/type signatures requested. Prefer correctness; do not include prose outside code unless asked.