How to filter the array by multiple element and find the sum in Swift?

Question

I'm trying to filter my array by some element. I want recordtype is contain "Income" and createdAt equal to a date but $0.createdAt! is an date type so I can't use .contain(""), what can I use?

recordFilter = record.filter { $0.recordtype!.contains("Income") /*|| $0.createdAt! = recordItem.createdAt!*/}

recordFilter output: (this result is not filter by createdAt yet)

[<Record: 0x600000099fa0> (entity: Record; id: 0xd0000000003c0000 <x-coredata://913F25A5-B2C9-4646-9091-5EFE7F906908/Record/p15> ; data: {
    accountbook = "first book";
    amount = "\U00a59.99";
    assest = nil;
    category = "\U6295\U8d44";
    createdAt = "2017-11-16 16:00:00 +0000";
    date = nil;
    id = 15;
    recordtype = "\U6536\U5165";
    remark = "";
    toAccBook = nil;
}), <Record: 0x600000099ff0> (entity: Record; id: 0xd000000000400000 <x-coredata://913F25A5-B2C9-4646-9091-5EFE7F906908/Record/p16> ; data: {
    accountbook = "first book";
    amount = "\U00a56.58";
    assest = nil;
    category = "\U5de5\U8d44";
    createdAt = "2017-11-16 16:00:00 +0000";
    date = nil;
    id = 16;
    recordtype = "\U6536\U5165";
    remark = "";
    toAccBook = nil;
})]

After that, I trying to get all the amount string in array and sum it. But I found that it's all separate string when I use this code, how can I group it in array and sum it or have any other way to do it?

let sum = recordFilter.map({Int($0.amount!.dropFirst())})
//[nil, nil]

for i in 0..<recordFilter.count{
    if recordFilter[i].amount != nil{

        let amountList = recordFilter[i].amount!.dropFirst()
        print(amountList) // I found that it's separate string.
        //9.99
        //11.22
        // ...

        //let intArray = amountList.map { Int($0)!}
        //let sum = amountList.reduce(0, +)
        //print(sum)

    }
}

your question is not clear that much. give some extra code and proper description so other user can understand easily. @Wan jern — Vishal Patel
– Vishal Patel, Commented Nov 17, 2017 at 4:50

Sohel L. · Accepted Answer · 2017-11-17 09:41:45Z

1

Well, If you want to fulfil two cases (recordtype == Income && createdAt == Your Date) so why you are not filtering using the &&?

recordFilter = record.filter { return $0.recordtype!.contains("Income") && $0.createdAt! == recordItem.createdAt!}

Please give a try and let me know if I am missing something?

If you want to sum here you go:

recordFilter.map{($0["amount"] as! Float)}.reduce(0, +)

edited Nov 17, 2017 at 9:41

answered Nov 17, 2017 at 5:01

Sohel L.

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8 Comments

Lester Over a year ago

Oh thanks! How can I get all the amount after that? because i want to sum it. let sum = recordFilter.map({Int($0.amount!.dropFirst())}).reduce(0,+) something like this but I got error @Sohil R. Memon

Lester Over a year ago

I can't covert the string array to int array

Sohel L. Over a year ago

@WanJern Amount is String, Double or Float ?

Lester Over a year ago

Opps, I changed it to Float already. how to sum it ? I got this error when I use reduce(0, +). Cannot invoke 'reduce' with an argument list of type '(Int, _)' @Sohil R.Memon

Lester Over a year ago

Hi, I found that double is limited in hundred number. how to expand it, is it possible? @Sohil R.Memon

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