mytrial/defaultcallback.js

This is my first module

var sum=function(a,b,callback){
var c=a+b;
if(typeof callback=="function"){
callback(c);
}
return c;
}
sum(11,22,function(r){
console.log("Result=",+r);
})
var s=sum(13,30);
console.log("R="+s);