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rstacruz/pi.js

Created March 28, 2017 08:19
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Approximating pi
Raw
pi.js
const PHI = (Math.sqrt(5) + 1) / 2
function divisor (n) {
if (n === 0) return Math.sqrt(2 + PHI)
var last = divisor(n - 1)
return Math.sqrt(2 + last)
}
function pi (n) {
if (n === 0) return 5 / PHI
var last = pi(n - 1)
return last * 2 / divisor(n)
}
console.log(pi(50))
//=> 3.1415926535897927
console.log(Math.PI)
//=> 3.141592653589793
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