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README.md | 4 years ago |
README.md
macro_calculator
Instructions
Create a function calculate_macros
which receives a vector of Food
structures and returns a json::JsonValue
.
Food {
name: <name>,
calories: [<value_in_kJ>, <value_in_kcal>],
fats: <fats_in_g>,
carbs: <carbs_in_g>,
proteins: <proteins_in_g>,
nbr_of_portions: <portions>
}
Both values in the calories array will be strings
, all other values will be f64
s.
The function should return a json with the following format (Macros struct):
"cals": <calories>,
"carbs": <carbs>,
"proteins": <proteins>,
"fats": <fats>,
The number of portions should be taken into account. The values of the macros refer to one portion. All values should be floats (f64) and should be the addition of every macronutrient in the provided array (cals is the addition of every calories, fats is the addition of every fats, and so on...). Every value should be rounded to two decimal places (ex: 12.29) or one decimal place if it ends in 0 (ex: 18.90 -> 18.9).
Hint: You will need the json
crate.
Expected Function
pub struct Food {
//expected public fields
}
pub fn calculate_macros(foods: Vec<Food>) -> json::JsonValue {
}
Notions
- json crate
Usage
Here is a program to test your function:
use macro_calculator::*;
fn main(){
let a = vec![
Food {
name: String::from("big mac"),
calories: ["2133.84kJ".to_string(), "510kcal".to_string()],
protein: 27.0,
fats: 26.0,
carbs: 41.0,
nbr_of_portions: 2.0,
},
Food {
name: "pizza margherita".to_string(),
calories: ["1500.59kJ".to_string(), "358.65kcal".to_string()],
protein: 13.89,
fats: 11.21,
carbs: 49.07,
nbr_of_portions: 4.9,
},
];
println!("{:#}", calculate_macros(a));
}
And its output:
$ cargo run
{
"cals": 2777.39,
"carbs": 322.44,
"proteins": 122.06,
"fats": 106.93
}
$