sqrt.js

function sq(A){
  let B = A / 2;

  let p = 0;
  let i = 0;

  for (;;){
    ++i;
    B = A / B + B;
    B = B / 2;
    
    if (p == B){
      console.log("Took " + i + " iterations.");
      return B;
    }
    
    p = B;
  }
}

console.log("C_SOL", sq(2500));
console.log("M_SOL", Math.sqrt(2500));

console.log("C_SOL", sq(9297482682382.872753537));
console.log("M_SOL", Math.sqrt(9297482682382.872753537));

console.log("C_SOL", sq(1));
console.log("M_SOL", Math.sqrt(1));

console.log("C_SOL", sq(0));
console.log("M_SOL", Math.sqrt(0));