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100 lines
3.0 KiB
Markdown
100 lines
3.0 KiB
Markdown
---
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id: 691f7773cddba1caf1bf5ecd
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title: "Challenge 134: Traveling Shopper"
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challengeType: 28
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dashedName: challenge-134
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---
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# --description--
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Given an amount of money you have, and an array of items you want to buy, determine how many of them you can afford.
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- The given amount will be in the format `["Amount", "Currency Code"]`. For example: `["150.00", "USD"]` or `["6000", "JPY"]`.
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- Each array item you want to purchase will be in the same format.
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Use the following exchange rates to convert values:
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|Currency|1 Unit Equals|
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|USD|1.00 USD|
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|EUR|1.10 USD|
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|GBP|1.25 USD|
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|JPY|0.0070 USD|
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|CAD|0.75 USD|
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- If you can afford all the items in the list, return `"Buy them all!"`.
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- Otherwise, return `"Buy the first X items."`, where `X` is the number of items you can afford when purchased in the order given.
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# --hints--
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`buyItems(["150.00", "USD"], [["50.00", "USD"], ["75.00", "USD"], ["30.00", "USD"]])` should return `"Buy the first 2 items."`.
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```js
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assert.equal(buyItems(["150.00", "USD"], [["50.00", "USD"], ["75.00", "USD"], ["30.00", "USD"]]), "Buy the first 2 items.");
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```
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`buyItems(["200.00", "EUR"], [["50.00", "USD"], ["50.00", "USD"]])` should return `"Buy them all!"`.
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```js
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assert.equal(buyItems(["200.00", "EUR"], [["50.00", "USD"], ["50.00", "USD"]]), "Buy them all!");
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```
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`buyItems(["100.00", "CAD"], [["20.00", "USD"], ["15.00", "EUR"], ["10.00", "GBP"], ["6000", "JPY"], ["5.00", "CAD"], ["10.00", "USD"]])` should return `"Buy the first 3 items."`.
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```js
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assert.equal(buyItems(["100.00", "CAD"], [["20.00", "USD"], ["15.00", "EUR"], ["10.00", "GBP"], ["6000", "JPY"], ["5.00", "CAD"], ["10.00", "USD"]]), "Buy the first 3 items.");
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```
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`buyItems(["5000", "JPY"], [["3.00", "USD"], ["1000", "JPY"], ["5.00", "CAD"], ["2.00", "EUR"], ["4.00", "USD"], ["2000", "JPY"]])` should return `"Buy them all!"`.
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```js
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assert.equal(buyItems(["5000", "JPY"], [["3.00", "USD"], ["1000", "JPY"], ["5.00", "CAD"], ["2.00", "EUR"], ["4.00", "USD"], ["2000", "JPY"]]), "Buy them all!");
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```
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`buyItems(["200.00", "USD"], [["50.00", "USD"], ["40.00", "EUR"], ["30.00", "GBP"], ["5000", "JPY"], ["25.00", "CAD"], ["20.00", "USD"]])` should return `"Buy the first 5 items."`.
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```js
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assert.equal(buyItems(["200.00", "USD"], [["50.00", "USD"], ["40.00", "EUR"], ["30.00", "GBP"], ["5000", "JPY"], ["25.00", "CAD"], ["20.00", "USD"]]), "Buy the first 5 items.");
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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 buyItems(funds, items) {
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return funds;
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}
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```
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# --solutions--
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```js
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function buyItems(funds, items) {
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const rates = {
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USD: 1.00,
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EUR: 1.10,
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GBP: 1.25,
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JPY: 0.0070,
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CAD: 0.75
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};
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const [amount, currency] = funds;
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let money = parseFloat(amount) * rates[currency];
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for (let i = 0; i < items.length; i++) {
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const [itemAmount, itemCurrency] = items[i];
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const itemCostUSD = parseFloat(itemAmount) * rates[itemCurrency];
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if (itemCostUSD > money) {
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return `Buy the first ${i} items.`;
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}
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money -= itemCostUSD;
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}
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return "Buy them all!";
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}
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```
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