This is the most important part:Anyone is capable of creating modules(aka libraries). To quoteIsaac Schlueter(of the node.js project):"Write small modules that each do one thing, and assemble them into other modules that do a bigger thing. You can't get into callback hell if you don'...
In this section, we will understand the concept of synchronous and asynchronous callback functions in JavaScript and their proper implementation: Synchronous Callback Function in JavaScript Synchronous callback functions are the type of function that execute instantly. These functions follow a sequence whe...
In node.js pure javascript style, I found a good solution in a library called wait.for, based upon fiber. An example: Obviously, it is non-blocking. No javascript callback syntax, no contract dependencies between client code and server code implementation details, above the logical contract....
The callback function itself is defined in the third argument passed to the function call. That code has another alert message to tell you that the callback code has now executed. You can see in this simple example that an argument passed into a function can be a function itself, and thi...
I'll admit that I was one of those people that decided to learn Node.js simply because of the buzz around it and how much everyone was talking about it. I figured there must be something special about it if it has this much support so early on in its life. I mostly came from a ...
By applying some simple rules, we were able to organize a set of known tasks in a sequential execution flow. Taking that code as a guideline, we can now generalize the solution with the following pattern:functiontask1 (cb) { asyncOperation(...
finalRequest(options, callback)retrieves the third file from the server, callingcallback(error, data)when done.dataisundefinedin case of an error, anderrorisundefinedin case of success(note: this is a common pattern in node.js) You can test your work withthis jsbin, where I’ve set up...
it("can use new framework", function() { function afterOha(callResult) { var currentBalance = callResult.deployedContractsSnapshot[WalletLibrary].currentBalance; assert.equal(currentBalance,0); } var walletLibraryOhaFC = new FunctionToCa...
using pure node.js(a callback hell): vardb=require("some-db-abstraction");functionhandleWithdrawal(req,res){try{varamount=req.param("amount");db.select("* from sessions where session_id=?",req.param("session_id"),function(err,sessiondata){if(err)throwerr;db.select("* from accounts wh...