JavaScript Execution Context – How JS Works Behind The Scenes
https://www.freecodecamp.org/news/execution-context-how-javascript-works-behind-the-scenes/
Before we dive in, here are some prerequisites to familiarize yourself with, because we'll use them often in this article.
- JavaScript Engine: A JavaScript engine is simply a computer program that receives JavaScript source code and compiles it to the binary instructions (machine code) that a CPU can understand.
How JavaScript Code Gets Executed
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The browser's JavaScript engine then creates a special environment to handle the transformation and execution of this JavaScript code. This environment is known as the Execution Context.
The Execution Context contains the code that's currently running, and everything that aids in its execution.
During the Execution Context run-time, the specific code gets parsed by a parser, the variables and functions are stored in memory, executable byte-code gets generated, and the code gets executed.
There are two kinds of Execution Context in JavaScript:
- Global Execution Context (GEC)
- Function Execution Context (FEC)
Global Execution Context (GEC)
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