Variable - typeof

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const helloWorld = "Hello World!"; console.log(typeof helloWorld); // zwróci 'string' console.log(typeof "Hello!"); // zwróci 'string' console.log(typeof(2)); // zwróci 'number' console.log(typeof(2 + 4.5)); // zwróci 'number' console.log(typeof true); // zwróci 'boolean' let undefinedVariable; console.log(typeof undefinedVariable); // zwróci 'undefined' console.log(typeof undefinedVariable === "undefined"); // zwróci 'true'
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