JS Generators Explained Template

yieldInterpreter.js

function interpreter(program) { 
  // takes in `cmd` — which is the value that was `yielded`   
  // and does something — UP TO YOU.   
  // it is important that it calls callback when done.   
  // optionally, it can communicate some value back to    
  // the program by passing it to the callback 
  function interpretCommand(cmd, callback) {
    callback();   
  } 
  
  const iterator = program(); 
  // run the program
  let next = iterator.next(); 
  // get the first command  
  // as long as there is the next command
  while (!next.done) { 
    const cmd = next.value;     
    // interpret it     
    interpretCommand(cmd, function(value) {
      // then get the next command
      next = iterator.next(value)
    });
  }   // program ended
} 

// use as:

interpreter(function* program() {
  yield someCommand;
});
// Understanding JavaScript generators cheatsheet⚠Fill in the `interpretCommand` function.         
// It takes a command and should call the callback when needed