Round() produces NaN

p5.js
1

When rounding very small numbers to some decimal places, e.g round(1.234567e-14, 2) , the result is NaN.
Not specifying decimals - round(1.234567e-14) - gives a correct result of 0.
Does someone know if that is a wanted behaviour or a bug?

2

This is :100: a bug :bug:. The implementation of the round function in p5.js is a horrible horrible idea :scream_cat::

p5.prototype.round = function(n, decimals) {
  if (!decimals) {
    return Math.round(n);
  }
  return Number(Math.round(n + 'e' + decimals) + 'e-' + decimals);
};

performing a multiplication and division by powers of 10 using string concatenation and conversion from string to Number is quite possibly the worst idea I’ve ever seen realized in javascript.

3

Submitted an issue: The round() function does not work when a number of digits is specified with very small numbers. · Issue #5340 · processing/p5.js · GitHub

4

@KumuPaul Thank you very much for checking, replying, agreeing and submitting.