How can objects in JavaScript be combined only if they have been defined?

As I delve into the world of JavaScript, I find myself in need of merging four objects together while ensuring that the resulting object does not contain any "undefined" values.

My current approach to this task looks like this:

  let result = {};
  result = Object.assign(result, first);
  if (second) result = Object.assign(result, second);
  if (third) result = Object.assign(result, third);
  if (fourth) result = Object.assign(result, fourth);
  return result;

However, I can't help but wonder if there is a more elegant solution out there. Do you know of one?

Answer №1

Object.assign does not take into account arguments that are undefined. To simplify, you can use the following code:

return Object.assign({}, one, two, three, four);

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