If it is undefined, it will not be equal to a string that contains the characters "undefined", as the string is not undefined. You can check the type of the variable:

While literally using the keyword undefined, Boolean(undefined) works, trying that with an undefined variable doesn't work, and that is the whole point of doing the check for null or …

Which basically returns right-side value, if the left-side value is null or undefined (our case with undefined instead of an object). const { item } = undefined or null // Uncaught TypeError: …

Feb 22, 2011 · As typeof returns undefined, undefined is a type where as null is an initializer indicates the variable points to no object (virtually everything in Javascript is an object).

typeof MyVariable == 'undefined' doesn't discern between an initialized variable with an undefined value and an undeclared variable unless the variable was initially declared and initialized to …

html = get.read() soup = BeautifulSoup(html) And I'm getting the following error: File "C:\Python34\lib\encodings\cp1252.py", line 19, in encode return …

What is undefined behavior (UB) in C and C++? What about unspecified behavior and implementation-defined behavior? What is the difference between them?

UnicodeDecodeError: 'charmap' codec can't decode byte X in position Y: character maps to <undefined> Asked 13 years, 9 months ago Modified 1 year, 2 months ago Viewed 2.0m times

May 7, 2009 · Yes, variables can have a value of undefined and you can explicitly assign values to them. Assigning undefined to a variable though is probably confusing, since it's a bit of a …

If you want to find the difference between an undefined property p of an object o, and a property p that has defined and set to undefined, you have to use the 'p' in o operator.