shallow merge, one of my favourites

shallowMerge.ts

function shallowMerge(a:any, b:any):any {
  let result:any = {};
  let tmp:any = {};
  Object.keys(a).forEach((x) => tmp[x]=x);
  Object.keys(b).forEach((x) => tmp[x]=x);
  let keys = Object.keys(tmp);

  for (var k of keys) {
    result[k] = null != b[k] ? b[k] : a[k];
  }
  return result;
}