EP-06 | undefined vs not defined in JS

undefined is a special keyword in JavaScript and undefined !== not defined.

More Resources & Guides

undefined vs not defined in JavaScript Why undefined Is a Value in JavaScript ReferenceError: x is not defined in JavaScript JavaScript Weakly Typed Language and undefined Behavior How to Check for undefined in JavaScript undefined vs null in JavaScript JavaScript: not defined vs ReferenceError vs TypeError Avoiding undefined Bugs in JavaScript JavaScript as a Loosely Typed Language Explained undefined in Function Parameters and Returns in JavaScript JavaScript typeof and instanceof for undefined Checks

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