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kdubbels/calculatePi.js

Created January 16, 2021 05:14
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Calculate digits of pi using Leibniz's formula
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calculatePi.js
// https://en.wikipedia.org/wiki/Leibniz_formula_for_%CF%80
//
// Requires lodash or underscore for the `range` function
function calculatePi(nTerms) {
var numerator = 4;
var denominator = 1;
var operation = 1;
var pi = 0;
const range = _.range(nTerms);
for (let i = 0; i < range.length; i++) {
pi += operation * (numerator / denominator);
denominator += 2;
operation *= -1;
}
return pi;
}
calculatePi(100000000) // 3.141592643589326 (The actual value is 3.1415926535897. It will get more accurate with a larger input)
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