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JavaScript typeof - W3Schools
typeof - JavaScript | MDN - MDN Web Docs
JavaScript TypeOf – How to Check the Type of a Variable or …
JavaScript typeof Operator - Programiz
JavaScript typeof
JavaScript Data Types: Typeof Explained - freeCodeCamp.org
JavaScript typeof Operator - GeeksforGeeks
JavaScript Type Checking – How to Check Type in JS with typeof()
JavaScript typeof : Understanding type checking in JavaScript
typeof - MDN Web Docs