Web Reference: Feb 10, 2022 · Whenever the JavaScript engine receives a script file, it first creates a default Execution Context known as the Global Execution Context (GEC). The GEC is the base/default Execution Context where all JavaScript code that is not inside of a function gets executed. Nov 7, 2025 · This page introduces the basic infrastructure of the JavaScript runtime environment. The model is largely theoretical and abstract, without any platform-specific or implementation-specific details. Modern JavaScript engines heavily optimize the described semantics. Learn how JavaScript execution context works with clear examples. Understand memory phases, call stack, scope, and hoisting in simple terms.
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