feat: perfect cube (TheAlgorithms#122)

* feat: perfect cube

* fix: errors due to floating-point approximation

Author: zFlxw

maths/perfect_cube.ts

@@ -0,0 +1,9 @@
+/**
+ * A number is a perfect cube, if the cube root is an integer.
+ *
+ * @param n The number to check.
+ */
+
+export const perfectCube = (n: number): boolean => {
+  return Math.round(n ** (1 / 3)) ** 3 === n;
+};

maths/test/perfect_cube.test.ts

@@ -0,0 +1,15 @@
+import { perfectCube } from "../perfect_cube";
+
+describe('perfect cube tests', () => {
+  it.each([
+    [27, true],
+    [9, false],
+    [8, true],
+    [12, false],
+    [64, true],
+    [151, false],
+    [125, true],
+  ])('The return value of %i should be %s', (n, expectation) => {
+    expect(perfectCube(n)).toBe(expectation);
+  });
+});