Function expression vs function declaration in javascript
on channel: Profu' de geogra'
Function Expression vs Function Declaration in JavaScript
In JavaScript, functions can be defined in two main ways: Function Expressions and Function Declarations. While both serve the same purpose of defining reusable blocks of code, they behave differently in terms of hoisting, syntax, and scope.
Function Declaration
A function declaration is a function that is defined using the function keyword at the top level of a script or block.
Key Features of Function Declarations:
✔ Hoisted – Can be called before being defined in the code.
✔ Must have a name – The function always requires an identifier.
✔ More readable – Best suited for defining reusable functions globally.
Function Expression
A function expression is a function that is assigned to a variable.
Key Features of Function Expressions:
✔ Not hoisted – Cannot be called before its definition.
✔ Can be anonymous – Function name is optional.
✔ Flexible – Useful for assigning functions dynamically, callbacks, and closures.
On this page of the site you can watch the video online Function expression vs function declaration in javascript with a duration of hours minute second in good quality, which was uploaded by the user Profu' de geogra' 18 February 2025, share the link with friends and acquaintances, this video has already been watched times on youtube and it was liked by 0 viewers. Enjoy your viewing!
