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import {
Collection,
isAssociative,
isIndexed,
isKeyed,
isList,
isMap,
isSeq,
isSet,
List,
Map as IMap,
Seq,
Set as ISet,
} from 'immutable';
describe('partition', () => {
let isOdd: jest.Mock<unknown, [x: number]>;
beforeEach(() => {
isOdd = jest.fn(x => x % 2);
});
it('partitions keyed sequence', () => {
const parts = Seq({ a: 1, b: 2, c: 3, d: 4 }).partition(isOdd);
expect(isKeyed(parts[0])).toBe(true);
expect(isSeq(parts[0])).toBe(true);
expect(parts.map(part => part.toJS())).toEqual([
{ b: 2, d: 4 },
{ a: 1, c: 3 },
]);
expect(isOdd.mock.calls.length).toBe(4);
// Each group should be a keyed sequence, not an indexed sequence
const trueGroup = parts[1];
expect(trueGroup && trueGroup.toArray()).toEqual([
['a', 1],
['c', 3],
]);
});
it('partitions indexed sequence', () => {
const parts = Seq([1, 2, 3, 4, 5, 6]).partition(isOdd);
expect(isIndexed(parts[0])).toBe(true);
expect(isSeq(parts[0])).toBe(true);
expect(parts.map(part => part.toJS())).toEqual([
[2, 4, 6],
[1, 3, 5],
]);
expect(isOdd.mock.calls.length).toBe(6);
});
it('partitions set sequence', () => {
const parts = Seq.Set([1, 2, 3, 4, 5, 6]).partition(isOdd);
expect(isAssociative(parts[0])).toBe(false);
expect(isSeq(parts[0])).toBe(true);
expect(parts.map(part => part.toJS())).toEqual([
[2, 4, 6],
[1, 3, 5],
]);
expect(isOdd.mock.calls.length).toBe(6);
});
it('partitions keyed collection', () => {
const parts = IMap({ a: 1, b: 2, c: 3, d: 4 }).partition(isOdd);
expect(isMap(parts[0])).toBe(true);
expect(isSeq(parts[0])).toBe(false);
expect(parts.map(part => part.toJS())).toEqual([
{ b: 2, d: 4 },
{ a: 1, c: 3 },
]);
expect(isOdd.mock.calls.length).toBe(4);
// Each group should be a keyed collection, not an indexed collection
const trueGroup = parts[1];
expect(trueGroup && trueGroup.toArray()).toEqual([
['a', 1],
['c', 3],
]);
});
it('partitions indexed collection', () => {
const parts = List([1, 2, 3, 4, 5, 6]).partition(isOdd);
expect(isList(parts[0])).toBe(true);
expect(isSeq(parts[0])).toBe(false);
expect(parts.map(part => part.toJS())).toEqual([
[2, 4, 6],
[1, 3, 5],
]);
expect(isOdd.mock.calls.length).toBe(6);
});
it('partitions set collection', () => {
const parts = ISet([1, 2, 3, 4, 5, 6]).partition(isOdd);
expect(isSet(parts[0])).toBe(true);
expect(isSeq(parts[0])).toBe(false);
expect(parts.map(part => part.toJS().sort())).toEqual([
[2, 4, 6],
[1, 3, 5],
]);
expect(isOdd.mock.calls.length).toBe(6);
});
});
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