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Oct 23, 2018 · It may seem surprising, but in my opinion the most important and fundamental concept to understanding the JavaScript language is understanding Execution Context. By properly learning it, you'll be positioned nicely to learn more advanced topics like hoisting, scope chains, and closures.
- What Is Hoisting in Javascript?
- Features of Hoisting
- Variable Lifecycle
- Different Examples of Javascript Hoisting
Hoisting is the default behavior in JavaScript where variable and function declarations are moved to the top of their respective scopes during the compilation phase. This guarantees that regardless of where these declarations appear within a scope, they can be accessed throughout that scope.
Declarations are hoisted, not initializations.Allows calling functions before their declarations.All variable and function declarations are processed before any code execution.Undeclared variables are implicitly created as global variables when assigned a value.However, since JavaScript allows us to both declare and initialize our variables simultaneously, so we can declare and initialize at the same time. Note:Always remember that in the background the Javascript is first declaring the variable and then initializing them. It is also good to know that variable declarations are processed before any code is...
2. JavaScript var hoisting
When we talk about ES5, the variable that comes into our minds is var. Hoisting with var is somewhat different. When it is compared to let/const. Let’s make use of var and see how hoisting works.
3. Function scoped variable
Let’s look at how function-scoped variables are hoisted. Example: There is no difference here as when compared to the code where we declared the variable globally. Example: We get undefined as the code seen by the interpreter. In order to avoid this pitfall, we can make sure to declare and assign the variable at the same time,before using it.
4. JavaScript hoisting with Let
We know that variables declared with let keywords are block scoped not function scoped and hence there is no problem when it comes to hoisting.
- 11 min
Aug 6, 2018 · The inner function’s scope chain includes the scope of its outer scope. When a function is called, an execution context and a scope chain are created. Also the function get’s a hidden [[Scope]] property.
Dec 27, 2023 · Outside the specified scope of a variable or function, the data cannot be accessed. There are three types of scopes available in JavaScript: Global Scope, Local / Function Scope, and Block Scope. Let us try to understand each one of them briefly in the following section.
Sep 14, 2023 · Hoisting: Execution context plays a role in hoisting, the behavior where variable and function declarations are moved to the top of their containing scope during compilation.
Jan 9, 2024 · Lexical scope describes how JavaScript functions are nested within each other, forming a chain of scopes. Each inner function has access to variables declared in its outer (enclosing) functions.
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Feb 1, 2022 · The first point can be explained by lexical scope: the returned function can access word because it exists in its outer scope. The second point is because of closures: A closure is a function combined with references to the variables defined outside of it.
