1 | /**
|
2 | * Compares two BigNumbers.
|
3 | * @param {BigNumber} x First value to compare
|
4 | * @param {BigNumber} y Second value to compare
|
5 | * @param {number} [epsilon] The maximum relative difference between x and y
|
6 | * If epsilon is undefined or null, the function will
|
7 | * test whether x and y are exactly equal.
|
8 | * @return {boolean} whether the two numbers are nearly equal
|
9 | */
|
10 | export function nearlyEqual(x, y, epsilon) {
|
11 | // if epsilon is null or undefined, test whether x and y are exactly equal
|
12 | if (epsilon === null || epsilon === undefined) {
|
13 | return x.eq(y);
|
14 | } // use "==" operator, handles infinities
|
15 |
|
16 |
|
17 | if (x.eq(y)) {
|
18 | return true;
|
19 | } // NaN
|
20 |
|
21 |
|
22 | if (x.isNaN() || y.isNaN()) {
|
23 | return false;
|
24 | } // at this point x and y should be finite
|
25 |
|
26 |
|
27 | if (x.isFinite() && y.isFinite()) {
|
28 | // check numbers are very close, needed when comparing numbers near zero
|
29 | var diff = x.minus(y).abs();
|
30 |
|
31 | if (diff.isZero()) {
|
32 | return true;
|
33 | } else {
|
34 | // use relative error
|
35 | var max = x.constructor.max(x.abs(), y.abs());
|
36 | return diff.lte(max.times(epsilon));
|
37 | }
|
38 | } // Infinite and Number or negative Infinite and positive Infinite cases
|
39 |
|
40 |
|
41 | return false;
|
42 | } |
\ | No newline at end of file |