import copyObject from './.internal/copyObject.js'
import createAssigner from './.internal/createAssigner.js'
import keys from './keys.js'

/**
 * This method is like `assign` except that it accepts `customizer`
 * which is invoked to produce the assigned values. If `customizer` returns
 * `undefined`, assignment is handled by the method instead. The `customizer`
 * is invoked with five arguments: (objValue, srcValue, key, object, source).
 *
 * **Note:** This method mutates `object`.
 *
 * @since 4.0.0
 * @category Object
 * @param {Object} object The destination object.
 * @param {...Object} sources The source objects.
 * @param {Function} [customizer] The function to customize assigned values.
 * @returns {Object} Returns `object`.
 * @see assignInWith
 * @example
 *
 * function customizer(objValue, srcValue) {
 *   return isUndefined(objValue) ? srcValue : objValue
 * }
 *
 * const defaults = partialRight(assignWith, customizer)
 *
 * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 })
 * // => { 'a': 1, 'b': 2 }
 */
const assignWith = createAssigner((object, source, srcIndex, customizer) => {
  copyObject(source, keys(source), object, customizer)
})

export default assignWith