Web Reference: Jan 16, 2026 · In this blog, we’ll demystify this behavior step by step, exploring concepts like variable declaration vs. initialization, the nature of `undefined`, hoisting, and why the console outputs `undefined` for declarations. By the end, you’ll understand exactly what’s happening under the hood. JavaScript Display Possibilities JavaScript can "display" data in different ways: Writing into an HTML element, using innerHTML or innerText. Writing into the HTML output using document.write(). Writing into an alert box, using window.alert(). Writing into the browser console, using console.log(). Be sure that you capture the result of the expression, not the value of the variable. It prints the result of this expression - which is undefined. And yes, var a is a valid expression on its own. Actually, you should rather be amused by why console prints undefined when you write var a = 3 or something like this.
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