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.
Understanding JavaScriptâs âundefinedâ. Compared to other languages, JavaScriptâs concept of undefined is a little confusing. In particular, trying to understand ReferenceErrors (âx is not definedâ) and how best to code against them can be frustrating.This is my attempt to straighten things out a little.n JavaScript there is Undefined (type), undefined (value) and undefined (variable). Undefined (type) is a built-in JavaScript type. undefined (value) is a primitive and is the sole value of the Undefined type. Any property that has not been assigned a value, assumes the undefined value. (ECMA 4.3.9 and 4.3.10).