✨ Add "find-outlier-number" challenge

challenges/find-outlier-number/README.md

@@ -0,0 +1,11 @@
+# find-outlier-number
+
+Created by [@Divlo](https://github.com/Divlo) at 5 July 2020.
+
+## Instructions :
+
+You are given an array (which will have a length of at least 3, but could be very large) containing integers. The array is either entirely comprised of odd integers or entirely comprised of even integers except for a single integer `N`. Write a function that takes the array as an argument and returns this "outlier" `N`.
+
+## Examples :
+
+See the `input-output.json` file for examples of input/output.

challenges/find-outlier-number/input-output.json

@@ -0,0 +1,26 @@
+[
+  {
+    "input": [[2, 4, 0, 100, 4, 11, 2602, 36]],
+    "output": 11
+  },
+  {
+    "input": [[160, 3, 1719, 19, 11, 13, -21]],
+    "output": 160
+  },
+  {
+    "input": [[0, 1, 2]],
+    "output": 1
+  },
+  {
+    "input": [[1, 2, 3]],
+    "output": 2
+  },
+  {
+    "input": [[2, 6, 8, 10, 3]],
+    "output": 3
+  },
+  {
+    "input": [[1, 1, 0, 1, 1]],
+    "output": 0
+  }
+]

challenges/find-outlier-number/solutions/typescript-outlier/README.md

@@ -0,0 +1,4 @@
+# typescript-outlier - find-outlier-number
+
+Programming language : TypeScript
+Created by [@Divlo](https://github.com/Divlo) at 5 July 2020.

challenges/find-outlier-number/solutions/typescript-outlier/solution.ts

@@ -0,0 +1,26 @@
+interface NumberObject {
+  value: number
+  index: number
+}
+
+function isOdd (number: number): boolean {
+  return number % 2 !== 0
+}
+
+function solution (numbers: number[]): number {
+  const oddNumbers: NumberObject[] = []
+  const evenNumbers: NumberObject[] = []
+
+  numbers.forEach((number, index) => {
+    const numberObject: NumberObject = { value: number, index }
+    return isOdd(number)
+      ? oddNumbers.push(numberObject)
+      : evenNumbers.push(numberObject)
+  })
+
+  const isValueThatDiffersFromOthers =
+    oddNumbers.length === 1 ? oddNumbers[0] : evenNumbers[0]
+  return isValueThatDiffersFromOthers.value
+}
+
+export default solution