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som-sm
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Mar 18, 2026
| expectType<AndAll<readonly boolean[]>>(boolean); | ||
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| // Boundary cases | ||
| expectType<AndAll<[]>>(true); |
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AndAll, when instantiated with an empty array ([]), returns true, unlike OrAll, which returns false. This behavior is intentional/correct; see:
- https://en.wikipedia.org/wiki/Logical_conjunction#:~:text=the%20empty%20conjunction%20(AND%2Ding%20over%20an%20empty%20set%20of%20operands)%20is%20often%20defined%20as%20having%20the%20result%20true.
- https://en.wikipedia.org/wiki/Clause_%28logic%29?utm_source=chatgpt.com#:~:text=The%20truth%20evaluation,vacuous%20truth.
This is the same reason why Array.prototype.every returns true for empty arrays, while Array.prototype.some returns false.
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