Web Reference: Mar 13, 2024 · Undefined is a type of Data type in JavaScript. It is a primitive value undefined, when a variable is declared and not initialized or not assigned with any value. 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 undefined. Free Code Camp Certification | Just Answer keys.freeCodeCamp - Online Test - Free Certification - JavaScript Algorithms and Data Structures - Basic Javascrip...
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