d3plus-common/es/src/assign.js

import { default as isObject } from "./isObject";
/**
    @function validObject
    @desc Determines if the object passed is the document or window.
    @param {Object} obj
    @private
*/

function validObject(obj) {
  if (typeof window === "undefined") return true;else return obj !== window && obj !== document;
}
/**
    @function assign
    @desc A deeply recursive version of `Object.assign`.
    @param {...Object} objects
    @example <caption>this</caption>
assign({id: "foo", deep: {group: "A"}}, {id: "bar", deep: {value: 20}}));
    @example <caption>returns this</caption>
{id: "bar", deep: {group: "A", value: 20}}
*/


function assign() {
  var _arguments = arguments;
  var target = arguments.length <= 0 ? undefined : arguments[0];

  var _loop = function _loop(i) {
    var source = i < 0 || _arguments.length <= i ? undefined : _arguments[i];
    Object.keys(source).forEach(function (prop) {
      var value = source[prop];

      if (isObject(value) && validObject(value)) {
        if (target.hasOwnProperty(prop) && isObject(target[prop])) target[prop] = assign({}, target[prop], value);else target[prop] = assign({}, value);
      } else if (Array.isArray(value)) target[prop] = value.slice();else target[prop] = value;
    });
  };

  for (var i = 1; i < arguments.length; i++) {
    _loop(i);
  }

  return target;
}

export default assign;