Adding min

src/maths/index.ts

@@ -1 +1,2 @@
 export * from './sum';
+export * from './min';

src/maths/min.test.ts

@@ -0,0 +1,18 @@
+import min from './min';
+
+describe('min', () => {
+  it('returns the minimum number', () => {
+    const result = min([2, 1, 3]);
+    expect(result).toEqual(1);
+  });
+
+  it('returns 1 of the minimum number', () => {
+    const result = min([2, 1, 1]);
+    expect(result).toEqual(1);
+  });
+
+  it('defaults to null when no values are passed in', () => {
+    const result = min([]);
+    expect(result).toBeNull();
+  });
+});

src/maths/min.ts

@@ -0,0 +1,6 @@
+export const min = (array: number[]): number | null => {
+  if (array.length === 0) return null;
+  return Math.min(...array);
+};
+
+export default min;