rambdax/src/symmetricDifference.js

Extended version of Rambda - a lightweight, faster alternative to Ramda

import { concat } from './concat'
import { filter } from './filter'
import { includes } from './includes'

export function symmetricDifference(x, y){
  if (arguments.length === 1){
    return _y => symmetricDifference(x, _y)
  }

  return concat(filter(value => !includes(value, y), x),
    filter(value => !includes(value, x), y))
}