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October 8, 2018 09:02
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Duplicates finder
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<script type="text/js-worker"> | |
const getRandomInt = (max) => Math.floor(Math.random() * (max + 1)); | |
const findDuplicates = (e) => { | |
const ints = [], dupes = [], n = e.data; | |
for(let i = 0; i <= n; i++){ | |
let randomInt = getRandomInt(n); | |
if (ints.includes(randomInt) && !dupes.includes(randomInt)){ | |
dupes.push(randomInt); | |
} | |
ints.push(randomInt); | |
if (i%100==0 || i==n){ | |
self.postMessage({i: i, dupes: dupes}); | |
} | |
} | |
} | |
self.addEventListener('message', (e) => findDuplicates(e)); | |
</script> | |
<input type="number" id="intsRange" step="1" min="1" max="5000000" value="1000000"/> | |
<button type="button" id="toggleStartStop">Start</button> | |
<div id="output"></div> |
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const findDuplicates = function(inputElement,outputElement) { | |
let worker = undefined; | |
const createWorker = () => { | |
const blob = new Blob( | |
Array.prototype.map.call( | |
document.querySelectorAll('script[type="text\/js-worker"]'), | |
(oScript) => oScript.textContent | |
), | |
{ type: 'text/javascript' } | |
); | |
return new Worker(window.URL.createObjectURL(blob)); | |
} | |
const startWorker = () => { | |
if(worker === undefined){ | |
worker = createWorker(); | |
worker.addEventListener('message', (e) => { | |
let out = `Processed ${e.data.i}. ${e.data.dupes.length} duplicates : ${e.data.dupes.join(' ')}`; | |
outputElement.innerHTML = out; | |
}); | |
worker.postMessage(inputElement.value); | |
} | |
} | |
const stopWorker = () =>{ | |
if (worker && worker.terminate){ | |
worker.terminate(); | |
} | |
worker = undefined; | |
} | |
const isRunning = () => { | |
return (worker) ? true: false; | |
} | |
return {startWorker,stopWorker, isRunning}; | |
} | |
const fd = new findDuplicates(document.getElementById('intsRange'), document.getElementById('output')); | |
document.getElementById('toggleStartStop').addEventListener('click', (e) => { | |
if (!fd.isRunning()){ | |
fd.startWorker(); | |
e.target.innerHTML='Stop'; | |
} else { | |
fd.stopWorker(); | |
e.target.innerHTML='Restart'; | |
} | |
}); |
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