Function Expression in Javascript
Function Expression in javascript is another method to write a function as an expression. This type of function can be used easily as an argument in another function.
1. Definition: Function expressions allow you to define functions as values assigned to variables or constants.
2. Anonymous Functions: Function expressions can be anonymous.
3. Named Functions: Function expressions can also have names.
4. Variable Assignment: Function expressions are assigned to variables or constants.
5. First-Class Citizens: In JavaScript, functions are treated as first-class citizens, which means they can be assigned as values, passed as arguments to other functions, and returned as values from other functions.
6. Lexical Scoping: Function expressions, like any other functions, create their own lexical scope. They can access variables from their outer scope.
7. Immediately Invoked Function Expressions (IIFE): Function expressions can be immediately invoked by wrapping them in parentheses and invoking them with additional parentheses.
8. Closures: Function expressions can create closures.
9. Function Expression vs. Function Declaration: Unlike function declarations, which are hoisted and can be accessed anywhere in the scope, function expressions are not hoisted and must be defined before they are used.
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