Node.js lodash extend() assign properties from source object to destination object

var _ = require('lodash');

// _.extend && _.assign assign properties from source object to the destination, 
//   overwriting any existing properties
// _.extend will also include inherited properties from it's prototype


var people = [/*from  w w w . j ava 2s  . c o m*/
  { id: 1, name: "Jim", age: 20, gender: 'm', enabled: true },
  { id: 2, name: "Bob", age: 34, gender: 'm', enabled: true },
  { id: 4, name: "Nancy", age: 42, gender: 'f', enabled: true },
];


var p2 = _.map(people,function(p) {
  return _.extend({ yearsOfExperience: p.age - 20 }, p);
});

console.log(p2);