forloop

forloop
=======

Node.js non-blocking for ( ; ; ) loop for long running tasks.


Introduction

Node.js is an asynchronous event driven framework for the V8 JavaScript engine. CPU-intensive task in your code will block the current thread of execution, including the event loop. Blocking the event loop can have catastrophic effects on the Node application.

$3

Nothing.

This library tackles the use case where CPU-intensive code block is executed repetitively inside a loop.

Installation

``
$ npm install forloop
`

Usage

###forloop(initialization, limit, increment, iterationCallback, finalCallback)

__Arguments__

* initialization - Initial value for the counter variable.
* limit - The final value of the counter to break the loop.
* increment - The value to increment the counter variable.
* iterationCallback(i) - A function to call on each itertation of the loop.
The current value of the counter variable is passed as the argument.
* finalCallback() - A function, which is called when the loop exits.

Example

Calculating Golden Ratio

$3

`js
var count = 10000000;
var φ = 0;

for (var i = 0; i < count; i++) {
φ = Math.sqrt(φ + Math.sqrt(1));
}

console.log("φ ≈ %d", φ);
`

$3


`js
var forloop = require('forloop');
var count = 10000000;
var φ = 0;

forloop(0, count, 1,
function(i) {
φ = Math.sqrt(φ + Math.sqrt(1));
},
function() {
console.log("φ ≈ %d", φ);
}
);
``

Test

$ npm test

License

MIT