✨ Add "inventory-update" challenge

challenges/inventory-update/README.md

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+# inventory-update
+
+Created by [@Divlo](https://github.com/Divlo) at 8 July 2020.
+
+## Instructions :
+
+Compare and update the inventory stored in a 2D array against a second 2D array of a fresh delivery. Update the current existing inventory item quantities (in `array1`). If an item cannot be found, add the new item and quantity into the inventory array. The returned inventory array should be in alphabetical order by item.
+
+## Examples :
+
+See the `input-output.json` file for examples of input/output.

challenges/inventory-update/input-output.json

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+[
+  {
+    "input": [
+      [
+        { "quantity": 21, "item": "Bowling Ball" },
+        { "quantity": 2, "item": "Dirty Sock" },
+        { "quantity": 1, "item": "Hair Pin" },
+        { "quantity": 5, "item": "Microphone" }
+      ],
+      [
+        { "quantity": 2, "item": "Hair Pin" },
+        { "quantity": 3, "item": "Half-Eaten Apple" },
+        { "quantity": 67, "item": "Bowling Ball" },
+        { "quantity": 7, "item": "Toothpaste" }
+      ]
+    ],
+    "output": [
+      { "quantity": 88, "item": "Bowling Ball" },
+      { "quantity": 2, "item": "Dirty Sock" },
+      { "quantity": 3, "item": "Hair Pin" },
+      { "quantity": 3, "item": "Half-Eaten Apple" },
+      { "quantity": 5, "item": "Microphone" },
+      { "quantity": 7, "item": "Toothpaste" }
+    ]
+  }, 
+  {
+    "input": [
+      [
+        { "quantity": 0, "item": "Bowling Ball" },
+        { "quantity": 0, "item": "Dirty Sock" },
+        { "quantity": 0, "item": "Hair Pin" },
+        { "quantity": 0, "item": "Microphone" }
+      ],
+      [
+        { "quantity": 1, "item": "Hair Pin" },
+        { "quantity": 1, "item": "Half-Eaten Apple" },
+        { "quantity": 1, "item": "Bowling Ball" },
+        { "quantity": 1, "item": "Toothpaste" }
+      ]
+    ],
+    "output": [
+      { "quantity": 1, "item": "Bowling Ball" },
+      { "quantity": 0, "item": "Dirty Sock" },
+      { "quantity": 1, "item": "Hair Pin" },
+      { "quantity": 1, "item": "Half-Eaten Apple" },
+      { "quantity": 0, "item": "Microphone" },
+      { "quantity": 1, "item": "Toothpaste" }
+    ]
+  }
+]

challenges/inventory-update/solutions/javascript-inventory/README.md

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+# javascript-inventory - inventory-update
+
+Programming language : JavaScript
+Created by [@Divlo](https://github.com/Divlo) at 8 July 2020.

challenges/inventory-update/solutions/javascript-inventory/solution.js

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+function solution (array1, array2) {
+  const result = [...array1]
+
+  array2.forEach(delivery2 => {
+    const foundResultIndex = result.findIndex(
+      deliveryResult => deliveryResult.item === delivery2.item
+    )
+    if (foundResultIndex === -1) return result.push(delivery2)
+    return (result[foundResultIndex].quantity =
+      result[foundResultIndex].quantity + delivery2.quantity)
+  })
+
+  return result.sort((a, b) => a.item.localeCompare(b.item))
+}
+
+module.exports = solution