nanomath/src/generic/utils.js

import {ReturnsAs} from './helpers.js'
import {ResolutionError, match} from '#core/helpers.js'
import {Returns} from '#core/Type.js'
import {Passthru} from "#core/TypePatterns.js"

export const isZero = match(Passthru, (math, [T]) => {
   if (!T) { // called with no arguments
      throw new ResolutionError('isZero() requires one argument')
   }
   const z = math.zero(T)
   const eq = math.equal.resolve([T, T])
   return ReturnsAs(eq, x => eq(z, x))
})