Execution Context

Summary

The environment (variables, scope chain, `this`) in which JavaScript code is evaluated and run — every function call creates a new one. Execution contexts explain how JavaScript establishes variable bindings, scope chains, and `this` for the global program and individual function calls.

• 1Trace through a small script and note when each execution context is created. Validate your understanding by applying it in a small practical example.
• 2Learn the difference between the global execution context and function execution contexts. Focus on understanding the underlying reason it works, not only memorizing the definition.
• 3Understand the two phases of context creation: creation and execution.