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im making a personal app for my job. i want to list indigent's for each thing i make so i know what im gonna need for the day in weight.

so lets say like i have 3 different things i can make 

food 1 = sugar: 2, eggs: 4, cheese: 3
food 2 = sugar: 5, eggs: 4, brownSugar: 3
food 3 = flour: 2, eggs: 4, cheese: 3

so let's say today have to make 2 batches of food 1, 3 batches of food 2 and 1 batch of food 3.

it would output

Sugar: 19
Eggs: 24
Cheese: 9
brownSugar: 9
Flour: 2

If anyone can point me in the right direction on going about this that would be great.. i was thinking set every food up as an array and try to add them each ingredients value by name.

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    You should show what you tried. People aren't going to show interest in helping you if it doesn't even look like you tried. Commented Mar 17, 2019 at 4:02

3 Answers 3

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Since your food is basically pairs (ingredient: count) it will ideally represented by Dictionary where key is your ingredient (right now use String, later could be any Hashable):

let food1 = ["sugar": 2, "eggs": 4, "cheese": 3]
let food2 = ["sugar": 5, "eggs": 4, "brownSugar": 3]
let food3 = ["flour": 2, "eggs": 4, "cheese": 3]

This allow us easily combine them by using Dictionary.merging(_, uniquingKeysWith:)

food1.merging(food2, uniquingKeysWith: +)
/// ["sugar": 7, "brownSugar": 3, "cheese": 3, "eggs": 8]

Here we merge food1 with food2 and combine amount of same ingredients by summing counts.

And to merge list of foods we could use reduce(into:, _)

[food1, food2, food3]
    .reduce(into: [:]) { sum, food in
        sum.merge(food, uniquingKeysWith: +)
    }
/// ["sugar": 7, "brownSugar": 3, "cheese": 6, "flour": 2, "eggs": 12]

Here we start with empty sum ([:]) and merging in it all foods.

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Kind of like:

var foodArray: [Foods] = []
// append all your foods in it when needed

func calculateAmount(foodChoices : [Foods]) -> (Sugar:Int, Eggs: Int, Cheese: Int) {

    var cheese = 0
    var sugar = 0
    var eggs = 0

    for g in foodChoices {
        if g.name == foodArray.name {
            cheese =+ g.cheese
            sugar =+ g.sugar
            eggs =+ g.eggs
        }
    }  
    return (Sugar, Eggs, Cheese)
}

You'll need to create a struct for your food and then you can work with it. Probably have better ways but this is the quickest I can think of

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4 Comments

Awesome. Thanks I’ll give it a shot.
if you are confused on how to use the tuple that comes back, have a look at stackoverflow.com/questions/27531195/… Please mark the answer if it helped :) it would help me a lot
This isn't a good use case for a tuple. It doesn't scale well. There are only 3 ingredients now, but what if it eventually needs to support hundreds?
yeah I'm assuming there is only 5 ingredients as this point based on his question
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function orderFood(food1count,food2count,food3count){
    var sugarCount = food1count*2+food2count*5;
    var eggCount = (food1count+food2count+food3count)*4;
    var flourCount = food3count*2;
    var cheeseCount = (food1count+food2count)*3;
    var brownSugarCount = food2count*3;
    console.log('sugar :'+sugarCount);
    console.log('egg :'+eggCount);
    console.log('flour :'+flourCount);
    console.log('cheese :'+cheeseCount);
}

orderFood(2,3,1);

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