joneskind , 3 months ago

in javascript a property is truthy if it exists

<span style="color:#323232;">myThing.property = "some string"
</span><span style="color:#323232;">
</span><span style="color:#323232;">if (myThing.property) { // true
</span><span style="color:#323232;">  // do something
</span><span style="color:#323232;">}
</span>

It works with everything except of course for falsy values

<span style="color:#323232;">myThing.number = someNumberThatShouldNotBeEqualToZero
</span><span style="color:#323232;">
</span><span style="color:#323232;">if (myThing.number) {
</span><span style="color:#323232;">  // do something very important with that number that should not be equal to zero
</span><span style="color:#323232;">}
</span><span style="color:#323232;">
</span><span style="color:#323232;">// This can fail at anytime without warning
</span>

So you’ve got to be extra careful with that logic when you’re dealing with numbers.

I am not saying it’s wrong though. I’m saying it’s often annoying.