element-easy/src/element-easy/utils/deep-assign.js

crud for element ui

import { isDef, isObject } from './index'

const { hasOwnProperty } = Object.prototype

function assignKey (to, from, key) {
  const val = from[key]

  if (!isDef(val)) {
    return
  }

  if (!hasOwnProperty.call(to, key) || !isObject(val)) {
    to[key] = val
  } else if (Array.isArray(val)) {
    to[key] = val.map((item) => item)
  } else {
    to[key] = deepAssign(Object(to[key]), from[key])
  }
}

export function deepAssign (to, from) {
  Object.keys(from).forEach((key) => {
    assignKey(to, from, key)
  })

  return to
}