nanomath/src/number/helpers.js

import {NumberT} from './NumberT.js'

import {onType} from '#core/helpers.js'
import {Returns} from '#core/Type.js'

export const plain = f => onType(
   Array(f.length).fill(NumberT), Returns(NumberT, f))

// Takes a behavior returning boolean, and returns a factory
// that returns that behavior if the boolean type is present,
// and otherwise wraps the behavior to return 1 or 0.
export const boolnum = behavior => math => {
    const {BooleanT} = math.types
    if (BooleanT) return Returns(BooleanT, behavior)
    return Returns(NumberT, (...args) => behavior(...args) ? 1 : 0)
}