UNDEFINED Definition & Meaning - Merriam-Webster
5 days ago · The meaning of UNDEFINED is not defined. How to use undefined in a sentence.
undefined - YouTube
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What Is Undefined? - Computer Hope
Sep 7, 2025 · The meaning of undefined with an overview, related terms, and examples from programming. Understand how undefined variables can lead to common error messages.
UNDEFINED | English meaning - Cambridge Dictionary
UNDEFINED definition: 1. not clearly described, stated, or known: 2. not having been given a definition (= a statement…. Learn more.
UNDEFINED | definition in the Cambridge English Dictionary
UNDEFINED meaning: 1. not clearly described, stated, or known: 2. not having been given a definition (= a statement…. Learn more.
How can I check for "undefined" in JavaScript? - Stack Overflow
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:
UNDEFINED definition in American English | Collins English Dictionary
not given meaning or significance, as by a definition; not defined or explained an undefined term
undefined - JavaScript | MDN - MDN Web Docs
Jan 10, 2026 · You can use undefined and the strict equality and inequality operators to determine whether a variable has a value. In the following code, the variable x is not initialized, and the if …
UNDEFINED - Meaning & Translations | Collins English Dictionary
Discover the word "UNDEFINED" in English: definitions, translations, synonyms, pronunciations, examples, and grammar insights - all in one complete resource.