You'll be enrolled at LMU Munich â Germany's #1 ranked university, take language courses at JYM, and design your own program of study.
Undefined is defined. Define means to set the limits, explain. So, undefine means not to set limits or not to explain.
A variable that has not been assigned a value is of type undefined. A method or statement also returns undefined if the variable that is being evaluated does not have an assigned value. A function returns undefined if a value was not returned. While it is possible to use it as an identifier (variable name) in any scope other than the global scope (because undefined is not a reserved word), doing so is a very bad idea that will make your code difficult to maintain and debug.