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23 lines
683 B
JavaScript
23 lines
683 B
JavaScript
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'use strict'
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/* A simple π estimation function using a Monte Carlo method
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* For 0 to `points`, take 2 random numbers < 1, square and add them to
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* find the area under that point in a 1x1 square. If that area is <= 1
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* then it's *within* a quarter-circle, otherwise it's outside.
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* Take the number of points <= 1 and multiply it by 4 and you have an
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* estimate!
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* Do this across multiple processes and average the results to
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* increase accuracy.
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*/
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module.exports = function (points, callback) {
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let inside = 0
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, i = points
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while (i--)
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if (Math.pow(Math.random(), 2) + Math.pow(Math.random(), 2) <= 1)
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inside++
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callback(null, (inside / points) * 4)
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}
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