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feat: Introduce BooleanT and boolean functions (#17)
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This PR adds a boolean section, as well as an isNaN predicate on numbers. In a TypeDispatcher, when BooleanT is present, isNaN returns a BooleanT. However, in a numbers-only TypeDispatcher, it returns 1 or 0 instead. Moreover, when booleans are subsequently added to a numbers-only instance, isNaN properly reconfigures itself to return BooleanT.

No predicates that depend on approximate equality testing or a configuration object are implemented in this PR.

This PR also implements type matching and dispatching with implicit conversions, and adds an implicit conversion from BooleanT to NumberT.

Reviewed-on: #17
Co-authored-by: Glen Whitney <glen@studioinfinity.org>
Co-committed-by: Glen Whitney <glen@studioinfinity.org>
This commit is contained in:
Glen Whitney 2025-04-13 16:29:51 +00:00 • committed by Glen Whitney
parent 14011984a0
commit 27fa4b0193
31 changed files with 432 additions and 142 deletions
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14
src/boolean/type.js Normal file
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import {BooleanT} from './BooleanT.js'
import {onType} from '#core/helpers.js'
import {Returns, Type, TypeOfTypes, Undefined} from '#core/Type.js'
import {NumberT} from '#number/NumberT.js'
const bool = f => Returns(BooleanT, f)
export const boolean = onType(
BooleanT, bool(p => p),
NumberT, bool(a => !!a),
TypeOfTypes, bool(() => true),
Undefined, bool(() => false),
[], bool(() => false)
)