lodash/differenceBy.js

import baseDifference from './.internal/baseDifference.js'
import baseFlatten from './.internal/baseFlatten.js'
import isArrayLikeObject from './isArrayLikeObject.js'
import last from './last.js'

/**
 * This method is like `difference` except that it accepts `iteratee` which
 * is invoked for each element of `array` and `values` to generate the criterion
 * by which they're compared. The order and references of result values are
 * determined by the first array. The iteratee is invoked with one argument:
 * (value).
 *
 * **Note:** Unlike `pullAllBy`, this method returns a new array.
 *
 * @since 4.0.0
 * @category Array
 * @param {Array} array The array to inspect.
 * @param {...Array} [values] The values to exclude.
 * @param {Function} iteratee The iteratee invoked per element.
 * @returns {Array} Returns the new array of filtered values.
 * @example
 *
 * differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor)
 * // => [1.2]
 */
function differenceBy(array, ...values) {
  let iteratee = last(values)
  if (isArrayLikeObject(iteratee)) {
    iteratee = undefined
  }
  return isArrayLikeObject(array)
    ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), iteratee)
    : []
}

export default differenceBy