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85 lines
2.7 KiB
Markdown
85 lines
2.7 KiB
Markdown
---
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id: 68ffb91507a5b645769328c7
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title: "Challenge 104: Recipe Scaler"
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challengeType: 29
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dashedName: challenge-104
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---
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# --description--
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Given an array of recipe ingredients and a number to scale the recipe, return an array with the quantities scaled accordingly.
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- Each item in the given array will be a string in the format: `"quantity unit ingredient"`. For example `"2 C Flour"`.
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- Scale the quantity by the given number. Do not include any trailing zeros and do not convert any units.
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- Return the scaled items in the same order they are given.
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# --hints--
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`scale_recipe(["2 C Flour", "1.5 T Sugar"], 2)` should return `["4 C Flour", "3 T Sugar"]`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(scale_recipe(["2 C Flour", "1.5 T Sugar"], 2), ["4 C Flour", "3 T Sugar"])`)
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}})
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```
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`scale_recipe(["4 T Flour", "1 C Milk", "2 T Oil"], 1.5)` should return `["6 T Flour", "1.5 C Milk", "3 T Oil"]`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(scale_recipe(["4 T Flour", "1 C Milk", "2 T Oil"], 1.5), ["6 T Flour", "1.5 C Milk", "3 T Oil"])`)
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}})
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```
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`scale_recipe(["3 C Milk", "2 C Oats"], 0.5)` should return `["1.5 C Milk", "1 C Oats"]`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(scale_recipe(["3 C Milk", "2 C Oats"], 0.5), ["1.5 C Milk", "1 C Oats"])`)
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}})
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```
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`scale_recipe(["2 C All-purpose Flour", "1 t Baking Soda", "1 t Salt", "1 C Butter", "0.5 C Sugar", "0.5 C Brown Sugar", "1 t Vanilla Extract", "2 C Chocolate Chips"], 2.5)` should return `["5 C All-purpose Flour", "2.5 t Baking Soda", "2.5 t Salt", "2.5 C Butter", "1.25 C Sugar", "1.25 C Brown Sugar", "2.5 t Vanilla Extract", "5 C Chocolate Chips"]`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(scale_recipe(["2 C All-purpose Flour", "1 t Baking Soda", "1 t Salt", "1 C Butter", "0.5 C Sugar", "0.5 C Brown Sugar", "1 t Vanilla Extract", "2 C Chocolate Chips"], 2.5), ["5 C All-purpose Flour", "2.5 t Baking Soda", "2.5 t Salt", "2.5 C Butter", "1.25 C Sugar", "1.25 C Brown Sugar", "2.5 t Vanilla Extract", "5 C Chocolate Chips"])`)
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}})
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```
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# --seed--
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## --seed-contents--
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```py
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def scale_recipe(ingredients, scale):
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return ingredients
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```
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# --solutions--
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```py
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def scale_recipe(ingredients, scale):
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scaled = []
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for item in ingredients:
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parts = item.split(" ")
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quantity = float(parts[0]) * scale
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unit = parts[1]
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ingredient_name = " ".join(parts[2:])
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if quantity.is_integer():
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quantity_str = str(int(quantity))
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else:
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quantity_str = str(quantity)
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scaled.append(f"{quantity_str} {unit} {ingredient_name}")
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return scaled
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```
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