MartinandMarco Pasqualetti
d476f8cbe1
This PR mainly refactors the code by extracting a "core" package which is then used by the "backend" and "frontend" apps. Apart from this the PR also contains several smaller changes like fixing dependabot, upgrading dependencies, aligned "package.json" files, added tests, ... addresses step 1 of #32 closes #136 --------- Co-authored-by: Marco Pasqualetti <marco.pasqualetti@live.com>
42 lines
1.2 KiB
JavaScript
42 lines
1.2 KiB
JavaScript
// @ts-check
|
|
|
|
/**
|
|
* Creates an asymmetric matcher for approximate numeric equality.
|
|
*
|
|
* This helper is intended for use in test frameworks (e.g., Jest) where
|
|
* values need to be compared within a configurable decimal precision
|
|
* instead of strict equality.
|
|
*
|
|
* The comparison succeeds when:
|
|
*
|
|
* |actual - expected| < 10^(-precision)
|
|
*
|
|
* For example, with `precision = 3`, values must be within `0.001`.
|
|
*
|
|
* @param {number} expected The expected numeric value to compare against.
|
|
*
|
|
* @param {number} [precision=10]
|
|
* The number of decimal places of tolerance. Higher values mean stricter
|
|
* comparison. Internally converted to epsilon = 10^-precision.
|
|
*
|
|
* @returns {{
|
|
* asymmetricMatch(actual: unknown): boolean,
|
|
* toAsymmetricMatcher(): string
|
|
* }} An object implementing Jest-style asymmetric matcher methods.
|
|
*
|
|
*/
|
|
export function approxNumber(expected, precision = 10) {
|
|
return {
|
|
asymmetricMatch(actual) {
|
|
if (typeof actual !== "number" || typeof expected !== "number") {
|
|
return false;
|
|
}
|
|
const epsilon = Math.pow(10, -precision);
|
|
return Math.abs(actual - expected) < epsilon;
|
|
},
|
|
toAsymmetricMatcher() {
|
|
return `≈ ${expected} (precision ${precision})`;
|
|
},
|
|
};
|
|
}
|