Humoyun humoyun

Tuning Storm+Trident

Tuning a dataflow system is easy:

The First Rule of Dataflow Tuning:
* Ensure each stage is always ready to accept records, and
* Deliver each processed record promptly to its destination

A quick overview of the node.js streams interface with basic examples.

This is based on @brycebaril's presentation, Node.js Streams2 Demystified

Overview

Streams are a first-class construct in Node.js for handling data.

Think of them as as lazy evaluation applied to data.

⇐ back to the gist-blog at jrw.fi

Advanced SCSS

Or, 16 cool things you may not have known your stylesheets could do. I'd rather have kept it to a nice round number like 10, but they just kept coming. Sorry.

I've been using SCSS/SASS for most of my styling work since 2009, and I'm a huge fan of Compass (by the great @chriseppstein). It really helped many of us through the darkest cross-browser crap. Even though browsers are increasingly playing nice with CSS, another problem has become very topical: managing the complexity in stylesheets as our in-browser apps get larger and larger. SCSS is an indispensable tool for dealing with this.

This isn't an introduction to the language by a long shot; many things probably won't make sense unless you have some SCSS under your belt already. That said, if you're not yet comfy with the basics, check out the aweso

Docker Commands, Help & Tips

Show commands & management commands

$ docker

Docker version info

ffmpeg

Converting Audio into Different Formats / Sample Rates

Minimal example: transcode from MP3 to WMA:
ffmpeg -i input.mp3 output.wma

You can get the list of supported formats with:
ffmpeg -formats

Convert WAV to MP3, mix down to mono (use 1 audio channel), set bit rate to 64 kbps and sample rate to 22050 Hz:

	<script src="http://cdnjs.cloudflare.com/ajax/libs/processing.js/1.4.1/processing-api.min.js"></script><html>
	<!--
	Created using jsbin.com
	Source can be edited via http://jsbin.com/pdfjs-helloworld-v2/8598/edit
	-->
	<body>
	<canvas id="the-canvas" style="border:1px solid black"></canvas>
	<input id='pdf' type='file'/>

	<!-- Use latest PDF.js build from Github -->

	function intersect(x1, y1, x2, y2, x3, y3, x4, y4){
	var a1, a2, b1, b2, c1, c2;
	var r1, r2 , r3, r4;
	var denom, offset, num;

	// Compute a1, b1, c1, where line joining points 1 and 2
	// is "a1 x + b1 y + c1 = 0".
	a1 = y2 - y1;
	b1 = x1 - x2;
	c1 = (x2 * y1) - (x1 * y2);

	export const ws = webSocket<WebsocketMessage>(`wss://${location.hostname}:${location.protocol === 'https:' ? 443 : 80}/ws/`);

	export const wsObserver = ws
	.pipe(
	retryWhen(errors =>
	errors.pipe(
	delay(1000)
	)
	)
	);

	// DOM traversal
	const parent = document.createElement("div");
	parent.innerHTML = `
	<div id="subTree">
	<form>
	<input type="text"/>
	</form>
	<p>Paragraph</p>
	<span>Span</span>
	</div>