Created
June 2, 2022 14:06
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Type level PowerSet in TypeScript
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| type Append<T, TArray> = TArray extends [infer TCurrent, ...infer Rest] ? | |
| TCurrent extends any[] ? [[T, ...TCurrent], ...Append<T, Rest>] : never | |
| : [] | |
| type PowerSet<TArray extends any[]> = | |
| TArray extends [infer TCurrent, ...infer Rest] ? [...Append<TCurrent, PowerSet<Rest>>, ...PowerSet<Rest>] : [[]] | |
| type Test = PowerSet<[1, 2, 3]> // [[1, 2, 3], [1, 2], [1, 3], [1], [2, 3], [2], [3], []] |
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