JavaScript(JS) number method - epsilon

The Number.EPSILON property in JavaScript represents the difference between 1 and the smallest representable number greater than 1. It is a small number, usually on the order of 10^-16, that can be used to compare two floating-point numbers for equality within a certain tolerance.

Here's an example usage:

const a = 0.1 + 0.2;
const b = 0.3;
if (Math.abs(a - b) < Number.EPSILON) {
  console.log("a and b are approximately equal.");
} else {
  console.log("a and b are not approximately equal.");
}

In the above example, the Number.EPSILON property is used to compare the numbers a and b for approximate equality. The Math.abs method is used to get the absolute difference between the two numbers, and then Number.EPSILON is used as a tolerance threshold for comparison. If the absolute difference between a and b is less than Number.EPSILON, then they are considered approximately equal and a message is logged to the console.