A tool for visualizing Execution Context, Hoisting, Closures, and Scopes in JavaScript.

// Click the "RUN" button to learn how this works! // This is an interactive vizualization. So try. // editing this code and see what happens. You. // from the dropdown! Built by Andrew Dillon. …

The scope can be seen as the set of rules which determines whether a variable is available or not in a specific execution context or region of the code. JS Scope is lexically determined.

You're looking at a little tool that helps to visualize the step-wise execution of JavaScript code. This can help people new to programming understand the mechanical and structured way …

Feb 15, 2023 · When the browser’s JavaScript engine encounters JavaScript, it creates a special environment for it where it handles the “translation” and execution of the JavaScript code we …

May 7, 2025 · I'm wondering whether there is already exists such tool doing: parse JS code (not expecting big block) visualize execution context / scope chain, and even prototype chain. The …

Nov 20, 2019 · The scope chain is basically a "chain of references" to objects that contain references to values (and other scopes) that are referencable in that execution context. (⛓: …

Expression detail? / Show builtins? / Escape analysis? const variable declaration

A tool for visualizing Execution Context, Hoisting, Closures, and Scopes in JavaScript.

Execution Context and Environments. Demystify variable scope, hoisting, and the execution stack by learning how JavaScript manages context and environments. Predict and control your …