feat(utils): approxEq fn

libs/util-fn/src/approx-eq.spec.ts

@@ -0,0 +1,23 @@
+import { approxEq } from './approx-eq';
+
+describe('approxEq', () => {
+  it('returns true for numbers within the default threshold', () => {
+    expect(approxEq(1.0000001, 1.0000002)).toBe(true);
+  });
+
+  it('returns false for numbers outside the default threshold', () => {
+    expect(approxEq(1.000001, 1.00001)).toBe(false);
+  });
+
+  it('returns true for numbers within a custom threshold', () => {
+    expect(approxEq(1.0001, 1.0002, 0.001)).toBe(true);
+  });
+
+  it('returns false for numbers outside a custom threshold', () => {
+    expect(approxEq(1.0001, 1.0002, 0.00001)).toBe(false);
+  });
+
+  it('returns true for identical numbers', () => {
+    expect(approxEq(1, 1)).toBe(true);
+  });
+});

libs/util-fn/src/approx-eq.ts

@@ -0,0 +1,4 @@
+/** Float equals check with threshold */
+export function approxEq(A: number, B: number, threshold = 1e-6): boolean {
+  return Math.abs(A - B) < threshold;
+}

libs/util-fn/src/index.ts

@@ -14,3 +14,4 @@ export * from './extract-prefix-from-map-name';
 export * from './leaderboard-key';
 export * from './omit';
 export * from './magic';
+export * from './approx-eq';