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Forked from animatedlew/sqrt.js
Created August 28, 2018 17:48
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Here is an implementation of a square root function in JavaScript using Newton's method.
var sqrt = function(x) {
var isGoodEnough = function(guess) {
return Math.abs(guess * guess - x) / x < 0.001;
};
var improve = function(guess) {
return (guess + x / guess) / 2;
};
var sqrIter = function(guess) {
return (isGoodEnough(guess)) ? guess : sqrIter(improve(guess))
};
return sqrIter(1.0);
};
console.log(
Math.sqrt(1000),
sqrt(1000)
);
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