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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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11
src/number/utils.js
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@ -1,3 +1,12 @@
import {plain} from './helpers.js'
import {plain, boolnum} from './helpers.js'
import {NumberT} from './NumberT.js'
import {Returns} from '#core/Type.js'
import {onType} from '#core/helpers.js'
export const clone = plain(a => a)
export const isnan = onType(NumberT, math => {
const {BooleanT} = math.types
if (BooleanT) return Returns(BooleanT, a => isNaN(a))
return Returns(NumberT, a => boolnum(isNaN(a)))
})