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import { describe, expect, it } from 'vitest';
import { groupBy } from '../../src/internal/group-by';
describe('groupBy()', () => {
it('should group values by key', () => {
const values = [
{ id: 1, name: 'John' },
{ id: 2, name: 'Jane' },
{ id: 3, name: 'John' },
];
const result = groupBy(values, ({ name }) => name);
expect(result).toEqual({
John: [
{ id: 1, name: 'John' },
{ id: 3, name: 'John' },
],
Jane: [{ id: 2, name: 'Jane' }],
});
});
it('should group by key and map values', () => {
const values = [
{ id: 1, name: 'John' },
{ id: 2, name: 'Jane' },
{ id: 3, name: 'John' },
];
const result = groupBy(
values,
({ name }) => name,
({ id }) => id
);
expect(result).toEqual({
John: [1, 3],
Jane: [2],
});
});
});
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