how do you create a function js?

function myFunction(){
	console.log('hi')
}
myFunction()multiplyfunc = (a, b) => { return a * b; }//(don't type behind the// type function to after that name it//
function name() {
  (name)=name
  console.log(name)
};
//{ symbol is used o group together code but you must create n index/array of 2(array3)//