12345678910111213
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))}