chore: Merge pull request #636 from qingwen23/find-average-median

Added averageMedian function

Maths/AverageMedian.js

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+/*
+ * Median: https://en.wikipedia.org/wiki/Median
+ *
+ * function averageMedian
+ * to find the median value of an array of numbers
+ * the numbers in an array will be sorted in ascending order by the function sortNumbers
+ * if the length of the array is even number, the median value will be the average of the two middle numbers
+ * else if the length of the array is odd number, the median value will be the middle number in the array
+ */
+
+/*
+  * Doctests
+  *
+  * > averageMedian([8, 9, 1, 2, 5, 10, 11])
+  * 8
+  * > averageMedian([15, 18, 3, 9, 13, 5])
+  * 11
+  * > averageMedian([1,2,3,4,6,8])
+  * 3.5
+  */
+
+const averageMedian = (numbers) => {
+  let median = 0; const numLength = numbers.length
+  numbers = numbers.sort(sortNumbers)
+
+  if (numLength % 2 === 0) {
+    median = (numbers[numLength / 2 - 1] + numbers[numLength / 2]) / 2
+  } else {
+    median = numbers[(numLength - 1) / 2]
+  }
+
+  return median
+}
+
+const sortNumbers = (num1, num2) => {
+  return num1 - num2
+}
+
+export { averageMedian }

Maths/test/AverageMedian.test.js

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+import { averageMedian } from '../AverageMedian'
+
+test('should return the median of an array of numbers:', () => {
+  const medianValue = averageMedian([1, 2, 6, 4, 5])
+  expect(medianValue).toBe(4)
+})
+
+test('should return the median of an array of numbers:', () => {
+  const medianValue = averageMedian([8, 9, 1, 2, 5, 10, 11])
+  expect(medianValue).toBe(8)
+})
+
+test('should return the median of an array of numbers:', () => {
+  const medianValue = averageMedian([15, 18, 3, 9, 13, 5])
+  expect(medianValue).toBe(11)
+})
+
+test('should return the median of an array of numbers:', () => {
+  const medianValue = averageMedian([1, 2, 3, 4, 6, 8])
+  expect(medianValue).toBe(3.5)
+})