ℹ️Engine Scope: Currently features full visualization for Scope Chain resolution, Execution Context (GEC/FEC), and Variable Hoisting. Additional JavaScript features will be enabled in upcoming updates!

JavaScript Code EditorDirectly edit or paste custom code

Step 0 of 0

←→StepSpaceRun

Press → (Step) or Space (Run)

Phase 1: Compilation(Hoisting & Memory Setup)

➔

Phase 2: Execution(Line-by-line Evaluation)

Execution Step Breakdown

Press "→" / click "▶" to step line-by-line, or press "Space" / click "▶ Run" for auto-play.

CALL STACK — Stack of Execution Contexts (LIFO)

LIFO Stack Frames

Global Execution Context (GEC)

▶ Active Frame

HEAP & MEMORY SPACE — Allocated Objects (GO, AO, FunctionObjects, ER)

ECMAScript Heap Area

No objects in memory

Console Output

console.log(...) Stream

No output generated yet