In short, the meaning ofundefinedis “undefined”. While this may not matter in many places, it has adverse effects in a few common use-cases: serialization and dictionaries. For serialization, one has to decide whether all missing values are the same, or explicit undefined’s are treated sp...
Both are primitive JavaScript values, meaning they are not considered objects and therefore don’t have methods or properties. Both are false when encountered in a Boolean context (falsy values). Despite both being falsy in a Boolean context, null or undefined is not loosely equal (==) to an...
If you are using Internet Explorer, you may need to go to TOOLS->INTERNET OPTIONS->ADVANCED and check the box beside "Display a notification about every script error". (Note: this box is often OFF by default, meaning your visitors won't see an error indication... instead the script just...
indexanditemvariables exist only in the block scope offorstatement. They don't have any meaning outside offor. lengthvariable is declared close to the source of its usage too. The refactored code is better because: The variables are not exposed to an uninitialized state, thus you have no ...
'JSON' is undefined, JSON object property appears defined, yet Javascript reports it as undefined, Undefined value type in JSON could be the, JavaScript Runtime Error in IE 10: 'JSON' Undefined (Error Code 0x800a1391)
JavaScript evaluates expressions in a left-to-right manner, meaning that for a || b, if a is false, only b will be evaluated. However, if a is true, b will not be examined. How to check if an element has an undefined value? If the element has a name instead of an id, we ...
ok, so I've discovered that (for my own computer anyway) if I open After Effects normally, I can run the script and it executes without a problem--meaning that it doesn't throw the JSON is undefined error. However, if I open AE through a subprocess and run the script automatically*,...
Meaning Explicitly no value Not initialized Typical Use Intentionally empty or absent value Variable declared but not yet assigned Type Annotation Has its own type null Has its own type undefined Default Behavior Does not trigger default function parameters Triggers default function parameters Function Pa...
Meaning, even when the remotes are invalidated and the caches are cleared, I'll keep getting the same error replayed until the consumer is rebooted. I unfortunately need to work on some other things, but I'll come back to this the week after next. Thank you for your help on this!
The result istrue, meaningnullis a value of the typenumberin JavaScript. Whereas, conducting the same test onundefinedreturnsfalse. isFinite(undefined) Type Coercion JavaScript is a loosely typed language, and because of this, when conducting mathematical operations JavaScript will automatically convert...