Consider this scenario:
const objId = new mongoose.Types.ObjectId('id goes here');
if (_.isEmpty(objId)) {
throw new Error('an error is thrown here');
}
I recently executed the code above and it got me thinking – is this a recent update? Interestingly, this code didn't cause any issues in the past.
When utilizing the code snippet below:
const _ = require("lodash");
const mongoose = require("mongoose");
const objectId = new mongoose.Types.ObjectId('deadcaffee00deadbeef1122');
const isEmpty = _.isEmpty(objectId);
console.log("keys", Object.keys(objectId));
for (let i in objectId) {
console.log("property", i, objectId[i]);
}
console.log({ objectId, isEmpty });
It becomes evident that the objectId variable only possesses one property identified by a Symbol.
Observing closely, this property is not shown as we log it (only valueOf gets logged), and the keys array turns out to be empty.
A look at the underlying source code reveals a similar iteration of keys using a for-in loop, mirroring my approach to logging properties.
As there are no suitable properties to satisfy hasOwnProperty, the loop concludes with a return value of true.
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