How to Custom Float Comparison?

[ozum]

Hi,

I need to use a custom comparison function for numbers for my use case. This function returns true for equality check when two floating point numbers are very close, even if they are not equal. Below is a simple implementation:

function isNumberEqual(a: number, b: number): boolean {
  if (a === b) return true;
  const diff = Math.abs(a - b);
  if (diff < Number.EPSILON) return true;
  return diff <= Number.EPSILON * Math.min(Math.abs(a), Math.abs(b));
}

How can I use this function in numeric comparisons in fast-equals?

Many thanks,

[planttheidea]

To-date, numbers have been treated as true primitives, and explicitly used SameValueZero comparison for equality checks without an override. However, I can see the use-case for having custom comparators for primitives, such as the numeric float example you provide. I can add arePrimitivesEqual support.