Functions execution context
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understanding function execution context in javascript: a comprehensive guide
javascript's execution context is a fundamental concept for understanding how your code runs. it's a complex but essential topic for becoming a proficient javascript developer. this tutorial will dive deep into function execution contexts, breaking down the components and demonstrating how they work with code examples.
*what is execution context?*
an execution context is an abstract environment in which javascript code is evaluated and executed. think of it as a container that holds all the necessary information needed to run a specific piece of code. whenever javascript code is executed, it's done so within an execution context.
*types of execution contexts:*
there are primarily two types of execution contexts in javascript:
1. *global execution context:* this is the base execution context. it's created when the javascript engine initially starts running your code. in a browser environment, the global execution context is associated with the `window` object (or `globalthis` in modern environments). variables and functions declared outside of any function are attached to the global object. the global execution context is always the first context created.
2. *function execution context:* a new function execution context is created whenever a function is called (invoked). each function call creates its own independent execution context. this is the core focus of this tutorial.
*components of a function execution context:*
each function execution context consists of the following key components:
1. *variable environment:* this is where variables declared inside the function (using `var`, `let`, and `const`) are stored. it also holds function declarations made within the function. crucially, the variable environment is subject to hoisting (more on that later).
2. *lexical environment:* this component determines how variables are resolved during execution. ...
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