bredfern’s gists

bredfern / html5-audio-visualizer.markdown

Created October 18, 2018 20:14

HTML5 Audio Visualizer

bredfern / index.html

Created October 19, 2018 21:34

WaveSurfer.js - equalizer with volume slider

	<h1>WaveSurfer.js - equalizer with volume slider</h1>
	<h4>
	<a target="_blank" href="https://github.com/entonbiba/examples/blob/master/wavesurfer/equalizer-with-volume-slider">Example reference on github.com</a>
	</h4>


	<div id="waveform"></div>

	<div class="container" style="text-align: center">
	<button onclick="wavesurfer.playPause()">

bredfern / css-range-slider-vertical.markdown

Created October 19, 2018 21:38

CSS Range Slider vertical

bredfern / index.html

Created November 6, 2018 19:40

VU meter

	<body layout="column stretch-stretch">
	<svg class='defs-only'>
	<defs>
	<g id="JB">

	<path id="jb-profil"
	stroke="#000" fill="#fff" stroke-miterlimit="10" d="M258.9,94.3c1,0.8,1.199,2.6,0.699,6.4
	c-0.699,5.6-0.3,6.2,4.801,7.3c2.5,0.5,3.1,1.1,3.1,3c0,2.6,2,3.1,5.8,1.5c1.7-0.7,1.8-0.3,1.601,4.1c-0.301,6.2,0.6,8.8,3.399,10.2
	c2.601,1.3,10.2,2.9,17.2,3.7c9,1.1,13.2,2.6,16.6,6.1l3.2,3.3l-2.6,1c-1.5,0.6-2.7,1.5-2.7,2c0,2.1,6.5,8.3,11,10.6
	c5.2,2.6,6.3,3.7,7.8,8c0.5,1.6,2.2,6.1,3.601,10c7,18.8,6.199,35.9-1.9,44.5c-1.3,1.4-2.5,3.9-2.8,5.6c-0.7,4.4-2,6.6-6.9,10.9

bredfern / gist:a63e5e6e8564991d22b50124965f5614

Created September 14, 2019 16:53

Flatting lists with reduce

	While not every language uses the "reduce" keyword you find the concept of reduction in different languages that implement functional code features so in c# its called using the Aggregate keyword but the concept is similar.

	So what is a reduction and how does it help us flatten multidimensional lists in general?

	You basically get to call a function on every item in an array however you get some special tools to keep track of this array so you have an accumulator that is like a bag where all the values drop in after each array is iterated, you have a current value placeholder an index which tells you which item you're on in the array and you have the ability to set an initial value to send to the first callback call.

	Here's an example of how reduce is used with a complex array to flatten it into a simple array:
	function flattenDeep(arr1) {
	return arr1.reduce((acc, val) => Array.isArray(val) ? acc.concat(flattenDeep(val)) : acc.concat(val), []);
	}

Brian Redfern bredfern