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compose.spec.ts
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compose.spec.ts
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import {compose, flow} from '../../src/composition'
import {drop, dropRight, take} from '../../src/array'
/**
* tsfun | compose
*
* supports type inference for up to 10 function args
*/
describe('compose', () => {
it('basic case', () =>
expect(
compose(take(1))([5, 6]))
.toEqual([5]));
it('nest', () =>
expect(
flow(
[5, 6, 8, 9],
compose(
drop(1),
dropRight(1),
compose(
dropRight(1)))))
.toEqual([6]));
// intended use case
//
// const evenAndSmallerThan6 = flowP(
// filter(smallerThan(6)),
// filter(even())
// flow(
// [1, 2, 3, 4, 6, 7, 8],
// evenAndSmallerThan6,
// take(1))
// .includes(2)
//
// -> true
it('typing', () => {
const result1: number = compose(parseInt)('3')
// const result2: number = compose(parseInt)(3) // WRONG
// const result: string = compose(parseInt)('3') // WRONG
const result2: string =
compose(parseInt, _ => _.toString())('3')
// const result: number = // WRONG
// compose(parseInt, _ => _.toString())('3')
const result3: number =
compose(
parseInt,
_ => _.toString(),
parseInt)
('3')
// const result: string = // WRONG
// compose(
// parseInt,
// _ => _.toString(),
// parseInt)
// ('3')
const result4: string =
compose(
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString())
('3')
// const result: number = // WRONG
// compose(
// parseInt,
// _ => _.toString(),
// parseInt,
// _ => _.toString())
// ('3')
const result5: number =
compose(
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString(),
parseInt)
('3')
// const result: string = // WRONG
// compose(
// parseInt,
// _ => _.toString(),
// parseInt,
// _ => _.toString(),
// parseInt)
// ('3')
const result6: string =
compose(
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString())
('3')
// const result: number = // WRONG
// compose(
// parseInt,
// _ => _.toString(),
// parseInt,
// _ => _.toString(),
// parseInt,
// _ => _.toString())
// ('3')
const result7: number =
compose(
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString(),
parseInt)
('3')
// const result: string = // WRONG
// compose(
// parseInt,
// _ => _.toString(),
// parseInt,
// _ => _.toString(),
// parseInt,
// _ => _.toString(),
// parseInt)
// ('3')
const result8: string =
compose(
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString())
('3')
// const result: number = // WRONG
// compose(
// parseInt,
// _ => _.toString(),
// parseInt,
// _ => _.toString(),
// parseInt,
// _ => _.toString(),
// parseInt,
// _ => _.toString())
// ('3')
const result9: number =
compose(
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString(),
parseInt)
('3')
// const result: string = // WRONG
// compose(
// parseInt,
// _ => _.toString(),
// parseInt,
// _ => _.toString(),
// parseInt,
// _ => _.toString(),
// parseInt,
// _ => _.toString(),
// parseInt)
// ('3')
const result10: string =
compose(
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString())
('3')
// const result: number = // WRONG
// compose(
// parseInt,
// _ => _.toString(),
// parseInt,
// _ => _.toString(),
// parseInt,
// _ => _.toString(),
// parseInt,
// _ => _.toString(),
// parseInt,
// _ => _.toString())
// ('3')
const result11: number =
compose(
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString(),
parseInt)
('3')
const result: string =
compose(
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString(),
parseInt,
_ => _.toString(),
parseInt) // not inferred anymore, result is typed to any
('3')
})
})