what is function* in javascript code example

Example 1: How to create a function in javascript

function addfunc(a, b) {
  return a + b;
  // standard long function
}

addfunc = (a, b) => { return a + b; }
// cleaner faster way creating functions!

Example 2: function js

function toCelsius(fahrenheit) {
  return (5/9) * (fahrenheit-32);
}