229 lines
4.9 KiB
Markdown
229 lines
4.9 KiB
Markdown
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---
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id: a56138aff60341a09ed6c480
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title: Inventory Update
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challengeType: 5
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forumTopicId: 16019
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dashedName: inventory-update
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---
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# --description--
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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 `arr1`). 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.
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# --hints--
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The function `updateInventory` should return an array.
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```js
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assert.isArray(
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updateInventory(
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[
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[21, 'Bowling Ball'],
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[2, 'Dirty Sock'],
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[1, 'Hair Pin'],
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[5, 'Microphone']
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],
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[
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[2, 'Hair Pin'],
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[3, 'Half-Eaten Apple'],
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[67, 'Bowling Ball'],
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[7, 'Toothpaste']
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]
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)
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);
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```
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`updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]])` should return an array with a length of 6.
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```js
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assert.equal(
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updateInventory(
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[
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[21, 'Bowling Ball'],
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[2, 'Dirty Sock'],
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[1, 'Hair Pin'],
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[5, 'Microphone']
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],
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[
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[2, 'Hair Pin'],
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[3, 'Half-Eaten Apple'],
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[67, 'Bowling Ball'],
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[7, 'Toothpaste']
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]
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).length,
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6
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);
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```
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`updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]])` should return `[[88, "Bowling Ball"], [2, "Dirty Sock"], [3, "Hair Pin"], [3, "Half-Eaten Apple"], [5, "Microphone"], [7, "Toothpaste"]]`.
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```js
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assert.deepEqual(
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updateInventory(
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[
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[21, 'Bowling Ball'],
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[2, 'Dirty Sock'],
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[1, 'Hair Pin'],
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[5, 'Microphone']
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],
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[
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[2, 'Hair Pin'],
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[3, 'Half-Eaten Apple'],
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[67, 'Bowling Ball'],
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[7, 'Toothpaste']
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]
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),
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[
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[88, 'Bowling Ball'],
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[2, 'Dirty Sock'],
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[3, 'Hair Pin'],
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[3, 'Half-Eaten Apple'],
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[5, 'Microphone'],
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[7, 'Toothpaste']
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]
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);
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```
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`updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [])` should return `[[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]]`.
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```js
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assert.deepEqual(
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updateInventory(
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[
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[21, 'Bowling Ball'],
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[2, 'Dirty Sock'],
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[1, 'Hair Pin'],
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[5, 'Microphone']
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],
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[]
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),
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[
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[21, 'Bowling Ball'],
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[2, 'Dirty Sock'],
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[1, 'Hair Pin'],
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[5, 'Microphone']
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]
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);
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```
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`updateInventory([], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]])` should return `[[67, "Bowling Ball"], [2, "Hair Pin"], [3, "Half-Eaten Apple"], [7, "Toothpaste"]]`.
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```js
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assert.deepEqual(
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updateInventory(
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[],
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[
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[2, 'Hair Pin'],
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[3, 'Half-Eaten Apple'],
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[67, 'Bowling Ball'],
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[7, 'Toothpaste']
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]
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),
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[
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[67, 'Bowling Ball'],
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[2, 'Hair Pin'],
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[3, 'Half-Eaten Apple'],
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[7, 'Toothpaste']
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]
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);
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```
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`updateInventory([[0, "Bowling Ball"], [0, "Dirty Sock"], [0, "Hair Pin"], [0, "Microphone"]], [[1, "Hair Pin"], [1, "Half-Eaten Apple"], [1, "Bowling Ball"], [1, "Toothpaste"]])` should return `[[1, "Bowling Ball"], [0, "Dirty Sock"], [1, "Hair Pin"], [1, "Half-Eaten Apple"], [0, "Microphone"], [1, "Toothpaste"]]`.
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```js
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assert.deepEqual(
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updateInventory(
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[
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[0, 'Bowling Ball'],
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[0, 'Dirty Sock'],
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[0, 'Hair Pin'],
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[0, 'Microphone']
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],
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[
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[1, 'Hair Pin'],
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[1, 'Half-Eaten Apple'],
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[1, 'Bowling Ball'],
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[1, 'Toothpaste']
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]
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),
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[
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[1, 'Bowling Ball'],
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[0, 'Dirty Sock'],
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[1, 'Hair Pin'],
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[1, 'Half-Eaten Apple'],
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[0, 'Microphone'],
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[1, 'Toothpaste']
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]
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);
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```
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# --seed--
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## --seed-contents--
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```js
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function updateInventory(arr1, arr2) {
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return arr1;
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}
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// Example inventory lists
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var curInv = [
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[21, "Bowling Ball"],
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[2, "Dirty Sock"],
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[1, "Hair Pin"],
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[5, "Microphone"]
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];
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var newInv = [
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[2, "Hair Pin"],
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[3, "Half-Eaten Apple"],
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[67, "Bowling Ball"],
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[7, "Toothpaste"]
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];
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updateInventory(curInv, newInv);
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```
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# --solutions--
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```js
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function updateInventory(arr1, arr2) {
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arr2.forEach(function(item) {
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createOrUpdate(arr1, item);
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});
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// All inventory must be accounted for or you're fired!
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return arr1;
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}
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function createOrUpdate(arr1, item) {
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var index = -1;
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while (++index < arr1.length) {
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if (arr1[index][1] === item[1]) {
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arr1[index][0] += item[0];
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return;
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}
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if (arr1[index][1] > item[1]) {
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break;
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}
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}
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arr1.splice(index, 0, item);
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}
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// Example inventory lists
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var curInv = [
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[21, 'Bowling Ball'],
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[2, 'Dirty Sock'],
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[1, 'Hair Pin'],
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[5, 'Microphone']
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];
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var newInv = [
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[2, 'Hair Pin'],
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[3, 'Half-Eaten Apple'],
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[67, 'Bowling Ball'],
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[7, 'Toothpaste']
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];
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updateInventory(curInv, newInv);
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```
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