Function expression vs function declaration in javascript
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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.
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