Killing asynchronous function calls in node.js

Maybe not, but check out the following code, you may get some idea to achieve this.

var logrunningFunction = function(){
  setTimeout(function(){
    console.log("Delayed");
    cb();
  }, 5000);

};


var cb = function(){
  console.log("long running function completed");
};
logrunningFunction(cb);

setTimeout(function(){
  cb = function(){
    console.log("Overwrite long running handler");
  };
},1000);