moy-fp/src/Function/descend.js

A functional programming library.

import curry from './curry'

/**
 * Ord b => (a -> b) -> a -> a -> Number
 */
const descend = curry(
  (fn, a, b) => {
    const aa = fn(a), bb = fn(b)
    return aa > bb ? -1 : aa === bb ? 0 : 1
  }
)

export default descend