HTML/math testing.html at main · LopenaFollower/HTML · GitHub

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<!DOCTYPE html>
<html>
	<head>
		<title></title>
		<meta name="viewport"content="width=device-width,initial-scale=1">
		<style>
		</style>
	</head>
	<body>
		<sub id=fps>fps</sub>
		<div id=disp></div>
		<script>
(function(){
	let elapsed=Date.now(),
		frame=0;
	const update=()=>{
		let r=4;
		if(Date.now()-elapsed<=1e3/r){
			frame+=r
		}else{
			fps.textContent=frame+" fps";
			elapsed=Date.now()
			frame=0
		}
		requestAnimationFrame(update)
	}
	requestAnimationFrame(update)
})();
const rate=5e4;
function display(a){
	switch(typeof a){
		case"object":
			a=JSON.stringify(a);
			break;
		case"function":
			let r=a();
			a=typeof r=="object"?JSON.stringify(r):r;
	}
	disp.innerText=a;
}
const harmonic=(()=>{
	let r=1,
		d=2;
	setInterval(()=>{
		for(let i=0;i<rate;i++){
			r+=1/d++;
		}
	})
	return()=>{return{r:r,d:d}};
})();
const piOverFour=(()=>{
	let r=0,
		d=0;
	setInterval(()=>{
		for(let i=0;i<rate;i++){
			r+=((-1)**(++d+1))/(2*d-1)
		}
	})
	return()=>r*4;
})();
const odseries=(()=>{
	let r=4,
		d=1,
		s=-1;
	setInterval(()=>{
		for(let i=0;i<rate;i++){
			d+=2
			r+=(4/d)*s;
			s*=-1;
		}
	})
	return()=>r;
})();
const piOverTwo=(()=>{
	let r=1,
		d=2;
	setInterval(()=>{
		for(let i=0;i<rate;i++){
			r*=(d*d)/((d-1)*(d+1))
			d+=2;
		}
	})
	return()=>r*2;
})();
setInterval(()=>{
	display(piOverFour);
},1e3/30);
		</script>
	</body>
</html>