JSFiddle - React, Tailwind, and code Playground

by Timatnet

JavaScript

var eps = 0.001;
function sqrt(x) {
    var y = x/2;
    for( ; Math.abs(y*y - x) > eps; ) {
        y = (y + x/y)/2;
    }
    return y;
}

alert(sqrt(4));
alert(sqrt(16));
alert(sqrt(256));
alert(sqrt(256*256));