Can you name and explain two main ways to declare functions in JavaScript?

In JavaScript, there are two main ways to declare functions:

1. Function Declaration

This is the classic way, where a function is declared using the function keyword and a name:

function greet(name) {
  return `Hello, ${name}!`;
}

Such functions are hoisted to the top of their scope, so they can be called before their declaration.

2. Function Expression

A function is created as a value and can be anonymous or named. It is usually assigned to a variable:

const greet = function(name) {
  return `Hello, ${name}!`;
};

In this case, the function is not hoisted, and can only be called after its declaration.

Arrow functions are also a type of function expression:

const greet = (name) => `Hello, ${name}!`;

They are shorter and have special behavior with the this context.

Thus, the main ways are function declaration and function expression.