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zip.spec.ts
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zip.spec.ts
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import {zip} from "../../src/array"
import {apply, flow} from '../../src/composition'
/**
* tsfun | zip
*/
describe('zip', () => {
it('base', () =>
expect(
zip([1,2,4], [3,4,5])
).toEqual([[1,3],[2,4],[4,5]])
)
it('shorter', () =>
expect(
zip([1,2], [3,4,5])
).toEqual([[1,3],[2,4]])
)
it('two args', () =>
expect(
zip([1,2], [3,4])
).toEqual([[1,3],[2,4]])
)
it('one argument list', () =>
expect(
zip([[1,2], [3,4]])
).toEqual([[1,3],[2,4]])
)
it('zipper - two argument lists', () =>
expect(
zip<number>(([x,y]) => x + y)([[1,2], [3,4]])
).toEqual([4,6])
)
it('empty argument lists', () =>
expect(
zip<number>()([[1,2], [3,4]])
).toEqual([[1,3],[2,4]])
)
it('typing', () => {
const result1: Array<Array<number>> = zip([[1,2],[3,4]])
const result2: Array<Array<number>> = flow([[1,2],[3,4]], zip())
const result3: Array<number> = flow([[1,2],[3,4]], zip(([x,y]) => x + y))
const result5: Array<number> = flow([[1,2],[3,4]], zip(apply((x: number, y: number) => x + y)))
})
it('composition 1a', () =>
expect(
flow([[1,2],[3,4]], zip())
).toEqual([[1,3],[2,4]])
)
it('composition 1', () =>
expect(
flow([[1,2],[3,4]], zip)
).toEqual([[1,3],[2,4]])
)
it('composition 2', () =>
expect(
flow(
[[3,4], [5,7]],
zip(([x,y]) => x + y))
).toEqual([8,11])
)
it('composition 2 - with apply', () =>
expect(
flow(
[[1,2],[3,4]],
zip(apply((x: number, y: number) => x + y)))
).toEqual([4,6])
)
it('zipper - single collection', () => expect(
zip(([x, y]) => x + y, [[1, 2], [3, 4, 5]])
).toEqual([4, 6]))
it('zipper - multiple collections', () => expect(
zip((x: number, y: number) => x + y, [1, 2], [3, 4, 5])
).toEqual([4, 6]))
it('with - 3 arguments', () => expect(
zip((x: number, y: number, z: number) => x + y + z, [1, 2], [3, 4, 5], [1, 1, 1])
).toEqual([5, 7]))
it('with - 4 arguments or more', () => expect(
zip((x: number, y: number, z: number, a: number) => x + y + z + a, [1, 2], [3, 4, 5], [1, 1, 1], [1, 1, 1])
).toEqual([6, 8]))
// it('with - 5 arguments', () => expect(
//
// zip((x: number, y: number, z: number, a: number, b: number) => x + y + z + a + b, [1, 2], [3, 4, 5], [1, 1, 1], [1, 1, 1], [1])
//
// ).toEqual([7]))
it('unzip', () => {
expect(
zip(zip([[1, 3, 5], [2, 4, 6]]))
).toEqual([[1, 3, 5], [2, 4, 6]])
expect(
zip(zip([[1, 3, 5, 18], [2, 4, 6]]))
).toEqual([[1, 3, 5], [2, 4, 6]])
})
})