Filter an array using value from another array

Question

I need to filter Schedules[ ] Array using Dates[ ] Array where "date_id" == "schedule_date_id".

I need only those elements where date_id matches schedule_date_id and then reload the table. I need to show Schedules according to dates.

What is the Swift code for this?

Below is the JSON I have:

{
dates =     (
            {
        "date_date" = "2017-11-04";
        "date_id" = 4;
        "date_image" = "https://project-isdental-cammy92.c9users.io/api/images/schedule-days/day_1.png";
        "date_title" = "Day 1";
    },
            {
        "date_date" = "2017-11-05";
        "date_id" = 5;
        "date_image" = "https://project-isdental-cammy92.c9users.io/api/images/schedule-days/day_2.png";
        "date_title" = "Day 2";
    }
);
schedules =     (
            {
        "schedule_date" = "2017-11-04";
        "schedule_date_id" = 4;
        "schedule_description" = "Schedule 7";
        "schedule_end_time" = "14:00:00";
        "schedule_id" = 7;
        "schedule_image" = "https://project-isdental-cammy92.c9users.io/api/images/schedules/day_1.png";
        "schedule_location" = Mumbai;
        "schedule_start_time" = "11:00:00";
    },
            {
        "schedule_date" = "2017-11-04";
        "schedule_date_id" = 4;
        "schedule_description" = "Schedule 8";
        "schedule_end_time" = "14:00:00";
        "schedule_id" = 8;
        "schedule_image" = "https://project-isdental-cammy92.c9users.io/api/images/schedules/day_1.png";
        "schedule_location" = Mumbai;
        "schedule_start_time" = "11:00:00";
    },
            {
        "schedule_date" = "2017-11-04";
        "schedule_date_id" = 4;
        "schedule_description" = "Schedule 9";
        "schedule_end_time" = "14:00:00";
        "schedule_id" = 9;
        "schedule_image" = "https://project-isdental-cammy92.c9users.io/api/images/schedules/day_1.png";
        "schedule_location" = Mumbai;
        "schedule_start_time" = "11:00:00";
    },
            {
        "schedule_date" = "2017-11-05";
        "schedule_date_id" = 5;
        "schedule_description" = "Schedule 10";
        "schedule_end_time" = "14:00:00";
        "schedule_id" = 10;
        "schedule_image" = "https://project-isdental-cammy92.c9users.io/api/images/schedules/day_2.png";
        "schedule_location" = Mumbai;
        "schedule_start_time" = "11:00:00";
    }
);
}

It's not at all clear what you're looking to do. Are you trying to do a join? — David Berry
– David Berry, Commented Oct 17, 2017 at 5:58
@DavidBerry I need elements from Schedule [ ] where "schedule_id" from Schedule [ ] should match "date_id" in Dates[ ] — Shikha Sharma
– Shikha Sharma, Commented Oct 17, 2017 at 5:59
I think you want to match date_id with schedule_date_id not schedule_id, right ? — Robert D. Mogos
– Robert D. Mogos, Commented Oct 17, 2017 at 9:08

Vini App · Accepted Answer · 2017-10-17 06:08:32Z

3

Use like this:

Swift 4

let filteredSchedules = schedules.filter { schedule in
    dates.contains(where: { $0["date_id"] as! Int == schedule["schedule_id"] as! Int }
)}
print(filteredSchedules)

Swift 3

let filteredSchedules = schedules.filter { schedule in
    dates.contains({ $0["date_id"] as! Int == schedule["schedule_id"] as! Int })
}
print(filteredSchedules)

edited Oct 17, 2017 at 6:08

answered Oct 17, 2017 at 5:59

Vini App

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8 Comments

Shikha Sharma Over a year ago

showing this error : Extraneous argument label 'where:' in call

Vini App Over a year ago

Updated the answer. Please check

Shikha Sharma Over a year ago

showing error at $0 : Cannot subscript a value of incorrect or ambiguous type

Vini App Over a year ago

Is your schedules or dates array optional?

Shikha Sharma Over a year ago

DateArray = EventSchedule["dates"] as! NSArray I've declared Dates array as this

|

Baig · Accepted Answer · 2017-11-09 06:23:25Z

1

To filter schedules array using date_id from datesArray

let dateId = 4
let filteredSchedules = schedules.filter { schedule in
    dates.contains(where: { dateId as! Int == schedule["schedule_id"] as! Int }
)}
print(filteredSchedules)

To assign dates to collectionView cell

cell.titleLabel.text = datesArray[indexPath.row]["datesArray"]

answered Nov 9, 2017 at 6:23

Baig

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Comments

iPatel · Accepted Answer · 2017-10-17 06:18:50Z

0

Try with below code

let newArray  = schedulesArray.filter { (schedulesDic) -> Bool in
            return datesArray.contains(where: { (datesDic) -> Bool in
                if schedulesDic["schedule_id"] as! Int == datesDic["date_id"] as! Int{
                    return true
                }
                else {
                    return false
                }
            })
        }
print(newArray)

Or short form of above code

let newArray  = schedulesArray.filter { (schedulesDic) -> Bool in
            datesArray.contains(where: { $0["date_id"] as! Int == schedulesDic["schedule_id"] as! Int })
        }
print(newArray)

edited Oct 17, 2017 at 6:18

answered Oct 17, 2017 at 6:08

iPatel

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1 Comment

Shikha Sharma Over a year ago

showing error at $0 : Cannot subscript a value of incorrect or ambiguous type

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