Simple recursive deep clone function in JavaScript.

deepClone.js

function deepClone(obj) {
  let objectType = typeof obj;
  if (objectType === "object" && obj !== null) {
    return Object.entries(obj).reduce((acc, [key, val]) => {
      acc[key] = deepClone(val);
      return acc;
    }, new obj.constructor());
  } else {
    return obj;
  }
}