Recently I was trying to check true/false value for an object. I was pretty sure that an empty object is set to true in Javascript (as well as an empty array).
However, when comparing an empty object to true, I always get false.
This was spotted quite late into my Javascript journey, so I would like to share it here
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Top comments (5)
The
===equality check is a strong check. If something is truthy is does not necessarily equality-check to true.Most everything in JavaScript is truthy. The 8 things that are falsy are:
false0""nullundefined-0(I know, that's underhanded, but-0is slightly different than0)NaNdocument.all(in the HTML context)Things that are truthy that occasionally mess people up:
var b = new Boolean(false)var a = []var o = {}Thank you for the concept! Wow. It's really concise and simple, yet can give me great bugs if not careful :)
and what is weired about it? I think it is super helpful. in the beginning I wrote something like this:
today I do
I think this is awesome.
and with the new optional chaining operator this get even better.
I was confused because if "an obj is true", then "obj === true" should return true, yet I got false. At least to my humanly logic, lol. I thought something wrong with my logic until I realized it was just the equal sign.
You need better understanding of truthy and falsy values in js... And what is object and what is boolean.