- cross-posted to:
- programmer_humor@programming.dev
- cross-posted to:
- programmer_humor@programming.dev
Meme transcription: Panel 1. Two images of JSON, one is the empty object, one is an object in which the key name maps to the value null. Caption: “Corporate needs you to find the difference between this picture and this picture”
Panel 2. The Java backend dev answers, “They’re the same picture.”
I don’t get it. The key still gets declared, but it’s value is null. “name” in an empty object would return undefined, not null, correct?
(Yes, this joke whooshed, but I am curious now.)
Indeed, and that turns out to be a problem if the JavaScript expects the key not to be there, but instead it is there. And then you try to tell the backend dev that the key shouldn’t be there, but he’ll try to convince you that it’s the same whether the key is not there or whether it’s assigned
nulland then you wonder if he’s messing with you, but actually he isn’t and then the only thing keeping you sane is bitching about it in meme form on lemmy.For many uses it is semantically the same.
But for cases where you need to know if something was intentionally set to null or was simply not set, the difference is enormous.
there is no “undefined” in java. this would either be a map containing the key value pair (“name”, null) or it would be mapped to an object of some class with an attribute “name” which can hold a null value. in any case {} wont equal {“name”:null}.