Types of function

Expression Function

• Function expression is stored in a variable

const multiply = function(a, b) {
  return a * b;
};

• the variable can be used as a function

• function expression are used to create anonymous functions.

• A expresion function can be assigned to a varaiable the passed a arrugument to another function and returned from function

• In JavaScript, function declarations and function expression refer to different ways of defining functions, there are different in the syntax but both the works are same .

Hosting

• function decleration can be called top of the function

• function expression can be called after function decleration.

• use function decleration in general - purpose function.

• use function expression to assign a variable in another function and for callback .

*Arrow function *

• Arrow function are shorten of expression function

const add = (a, b) => {
  return a + b;
};

• arrow function uses the arrow symbole

• This arrow function does the same thing as a regular function expression.

• Arrow functions are not hoisted

• Parentheses are required for zero or multiple parameters.