What is the time and space complexity of Hoisting Demo?

Time complexity: O(1). Space complexity: O(1).

Hoisting Demo

Easy

Code

Loading editor...

Tap Analyze to see visualization

Click Analyze to visualize

See step-by-step execution, variables, and output

Variables

Run code to see variables

Output

Console output will appear here

Press Space to start•← → to step•? all shortcuts

Solution Guide: Hoisting Demo

Approach

Contrast function hoisting (fully hoisted and callable before declaration), var hoisting (declaration hoisted but value is undefined), and let/const temporal dead zone (not accessible before declaration). Loop scoping highlights var leaking into outer scope versus let being block-scoped.

Complexity Analysis

Time: O(1)
Space: O(1)

Pattern

Hoisting and TDZ

Why It Works

JavaScript hoists declarations during the compile phase. Function declarations are fully initialized, var is initialized to undefined, and let/const remain uninitialized until execution reaches the declaration.

Updated Feb 2026