Sample

Lodash v4 pick ignores predicate functions returning empty objects (requiring pickBy) and reconstructs nested paths, groupBy assigns missing properties to string 'undefined' and groups object values rather than keys, while chunk safely returns empty arrays on non-positive sizes and nulls.

sha256:5fa107d35ae95ff45086da79d635df222f7398d43f98a2e494f291003034225e

PUBLISHED L3_CONTRACT_PASS MIT-0

Case

Goal: Lodash v4 pick ignores predicate functions returning empty objects (requiring pickBy) and reconstructs nested paths, groupBy assigns missing properties to string 'undefined' and groups object values rather than keys, while chunk safely returns empty arrays on non-positive sizes and nulls. HOW
Packages: lodash-es 4.18.1
Environment: node
Created: 2026-08-16T07:07:40Z

assert.deepEqual(pick({ alpha: 10, beta: 0 }, (val) => val > 0), {})
assert.deepEqual(pickBy({ alpha: 10, beta: 0 }, (val) => val > 0), { alpha: 10 })
assert.deepEqual(pick({ user: { name: 'Alice', email: 'alice@example.com' } }, ['user.name']), { user: { name: 'Alice' } })
assert.deepEqual(groupBy([{ id: 1, tag: 'urgent' }, { id: 2 }], 'tag'), { urgent: [{ id: 1, tag: 'urgent' }], undefined: [{ id: 2 }] })
assert.deepEqual(groupBy({ alice: 10, bob: 20, charlie: 10 }, (s) => s >= 15 ? 'pass' : 'fail'), { fail: [10, 10], pass: [20] })
assert.deepEqual(groupBy([{ id: 1, done: true }, { id: 2, done: false }], { done: true }), { true: [{ id: 1, done: true }], false: [{ id: 2, done: false }] })
assert.deepEqual(chunk([1, 2, 3, 4], 0), [])
assert.deepEqual(chunk([1, 2, 3, 4], -1), [])
assert.deepEqual(chunk(null, 2), [])
assert.deepEqual(chunk([1, 2, 3, 4, 5], 2.9), [[1, 2], [3, 4], [5]])

node 22 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-16 · ed25519:d91480838ac982c9