Added FindMax to Maths

Maths/FindMax.js

@@ -0,0 +1,17 @@
+/**
+ * Function to find the maximum number given an array of integers
+ * Returns the maximum number of the array
+ * If the array is empty it returns the string 'Array is empty'
+ */
+
+export const findMax = (arr) => {
+  if (arr.length === 0) { return 'Array is empty' }
+
+  let max = arr[0]
+  arr.forEach(element => {
+    if (element > max) {
+      max = element
+    }
+  })
+  return max
+}

Maths/test/FindMax.test.js

@@ -0,0 +1,16 @@
+import { findMax } from '../FindMax'
+
+test('Should return the highest number in the array', () => {
+  const max = findMax([2, 5, 1, 12, 43, 1, 9])
+  expect(max).toBe(43)
+})
+
+test('Should return the highest number in the array', () => {
+  const max = findMax([21, 513, 6])
+  expect(max).toBe(513)
+})
+
+test('Should return the highest number in the array', () => {
+  const max = findMax([])
+  expect(max).toBe('Array is empty')
+})