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February 20, 2020 11:02
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Web Audio API
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javascript:(function(){const%20audioCtx=new(window.AudioContext||window.webkitAudioContext);const%20oscillator=audioCtx.createOscillator();oscillator.connect(audioCtx.destination);oscillator.type="sine";let%20numItems=0;oscillator.frequency.setValueAtTime(1,audioCtx.currentTime);oscillator.start();const%20observer=new%20MutationObserver(function(mutationsList){numItems+=mutationsList.length;oscillator.frequency.setValueAtTime(Math.log(numItems+1)*440,audioCtx.currentTime);setTimeout(()=>{numItems-=mutationsList.length;if(numItems===0){oscillator.frequency.setValueAtTime(1,audioCtx.currentTime)}else{oscillator.frequency.setValueAtTime(Math.log(numItems+1)*440,audioCtx.currentTime)}},100)});observer.observe(document,{attributes:true,childList:true,subtree:true,characterData:true})})(); |
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// function decorator | |
var withJson = f => async url => { | |
var result = await f(url) | |
.catch(error => {console.log('->', error)}) | |
return result | |
} | |
// decorated function | |
var fetchJson = withJson(fetch) | |
console.time('fetch') | |
await fetchJson('http://localhost:3000/api/v1/dataset/list') | |
.then(response => response.json()) | |
.then(data => {console.log(data)}) | |
console.timeEnd('fetch') | |
/* | |
await fetch('http://localhost:3000/api/v1/dataset/list') | |
.then(response => response.json()) | |
.then(data => {console.log(data)}) | |
*/ |
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/* | |
Copy this into the console of any web page that is interactive and doesn't | |
do hard reloads. You will hear your DOM changes as different pitches of | |
audio. | |
I have found this interesting for debugging, but also fun to hear web pages | |
render like UIs do in movies. | |
*/ | |
const audioCtx = new (window.AudioContext || window.webkitAudioContext)() | |
const observer = new MutationObserver(function(mutationsList) { | |
const oscillator = audioCtx.createOscillator() | |
oscillator.connect(audioCtx.destination) | |
oscillator.type = "sine" | |
oscillator.frequency.setValueAtTime( | |
Math.log(mutationsList.length + 5) * 880, | |
audioCtx.currentTime, | |
) | |
oscillator.start() | |
oscillator.stop(audioCtx.currentTime + 0.01) | |
}) | |
observer.observe(document, { | |
attributes: true, | |
childList: true, | |
subtree: true, | |
characterData: true, | |
}) |
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const audioCtx = new window.AudioContext(); | |
const oscillator = audioCtx.createOscillator(); | |
oscillator.connect(audioCtx.destination); | |
oscillator.type = "sine"; | |
let numItems = 0 | |
oscillator.frequency.setValueAtTime( | |
1, | |
audioCtx.currentTime | |
); | |
oscillator.start(); | |
const observer = new MutationObserver(function (mutationsList) { | |
numItems += mutationsList.length | |
oscillator.frequency.setValueAtTime( | |
Math.log(numItems + 1) * 440, | |
audioCtx.currentTime | |
); | |
setTimeout(() => { | |
numItems -= mutationsList.length | |
if (numItems === 0) { | |
oscillator.frequency.setValueAtTime( | |
1, | |
audioCtx.currentTime | |
) | |
} else { | |
oscillator.frequency.setValueAtTime( | |
Math.log(numItems + 1) * 440, | |
audioCtx.currentTime | |
) | |
} | |
}, 100) | |
}); | |
observer.observe(document, { | |
attributes: true, | |
childList: true, | |
subtree: true, | |
characterData: true | |
}); |
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