Scopes and Function Expression.md

Scopes Expression

Function Expression

Function Expression allows us to create an anonymous function which doesn't have any function name which is the main difference between fucntion expression and function Declaration. A function expression can be used as an IIFE(immediately invoked Function Expression)which runs as soon as it is defined. A function expression has to be stored in a variable and can be accessed using variableName.

• Syntax for function Decalartion:-

function declaration() {
  console.log("hello declartion");
}

• Syntax for function Expression(anonymous):-

let variableName = function (x, y) {
  console.log("No name");
};

• Syntax for function Expression (named):-

let variablename = function functionName(x, y) {
  console.log("Named function");
};

Naming Function Expression

If a function is specified as a function Expression. It can be given a name.

• There are three reason to make a solid case they are :-

1. Reliable function self-reference (recursion.etc)
2. more Degubble stack traces
3. More self-documenting code

Arrow function

Arrow function is a Function with Arrow mark (=>) and works as usual like regular function.

Arrow function is one of the features introduced in the Es6 version of javascript. It allows you to create functions in a cleaner way compared to regular functions.

Arrow functiion is just like Regular function but in arrow function it is callable but not constructable like (New keyword) and (this keyword)

• For Example:-

var arrowfunction = (a, b) => a * b;

For More Information Click Below:-

Scopes & Function Expressions