what is return keyword in javascript code example

Example 1: return this javascript

Function.prototype.method = function (name, func) {
  this.prototype[name] = func;
  return this;
};

Example 2: what does return do in javascript

function add(a, b) {
  return a + b; //Return stops the execution of this function
}

var sum = add(5, 24); //The value that was returned got but inside the variable sum