An approach to deep cloning objects in JavaScript

cloneDeep.js

const cloneDeep = source => {
 const result = {};

 Object.entries(source).forEach(entry => {
   const [key, value] = entry;

   if (typeof value === 'object') {
     result[key] = cloneDeep(value);
   } else {
     result[key] = value;
   }
 });
}

// Note that this doesn't support arrays. It turns arrays into their object form.
// ['foo', 'bar'] becomes {0: 'foo', 1: 'bar'}