crocks/core/isContravariant.js

A collection of well known Algebraic Datatypes for your utter enjoyment.

/** @license ISC License (c) copyright 2017 original and current authors */
/** @author Ian Hofmann-Hicks (evil) */

var hasAlg = require('./hasAlg')

// isContravariant : a -> Boolean
function isContravariant(m) {
  return !!m && hasAlg('contramap', m)
}

module.exports = isContravariant