Best way to prevent/handle divide by 0 in javascript

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There is no way to do that with the normal / and /= operators.

The best way to do what you want is with guards:

function notZero(n) {
  n = +n;  // Coerce to number.
  if (!n) {  // Matches +0, -0, NaN
    throw new Error('Invalid dividend ' + n);
  }
  return n;
}

and then do division like

numerator / notZero(denominator)

Alternatively you can always guard the output

function dividend(numerator, denominator) {
  var quotient = numerator / denominator;
  if (quotient !== quotient) { throw new Error(numerator + "https://stackoverflow.com/" + denominator); }
  return quotient;
}

but that loses the readability and expressiveness of /=.

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