Function to compare two objects and return keys of first against second

compareObject.js

/* example of use 
const m ={uno:'1',dos:2,tres:'3',cuatro:'4',cinco:{uno:1,dos:2,tres:3}}
const n = {uno:true,dos:true,tres:true}
console.log(extract(m,n))
// return {uno:'1',dos:2,tres:'3'}
*/
function extract(original, newObj) {
  const responseNewObj = {};
  Object.keys(original).forEach((e) => {
    if (newObj[e] !== undefined) {
      responseNewObj[e] = original[e];
    }
  });
  return responseNewObj;
}