How can I find a specific item from custom object in a huge array - Swift

Question

How can I find a specific item from custom object in a huge array like bellow?

struct ResponseCourseTypeFilter {
    var returnCourseTypeFilter: [[String : String]]
}

struct ViewModelCourseTypeFilter {
    struct DisplayedCourseTypeFilter {
        var titlesCourseType: String
        var isSelectedType: Bool
    }
    var displayedCourseTypeFilter: [DisplayedCourseTypeFilter]
}

I need to get values titlesCourseType are true.

My array is huge.

I can't find the array example, but I guess your array is an array of CourseTypeFilter. array.first(where: { $0. isSelectedType == true }) this is if you need only one item, and array.filter { $0. isSelectedType == true } for all of them. Google magic — Savca Marin
– Savca Marin, Commented Nov 4, 2019 at 9:14
titlesCourseType is a string, did you mean the property isSelectedType? And do you want to filter the array displayedCourseTypeFilter or some other array? — Joakim Danielson
– Joakim Danielson, Commented Nov 4, 2019 at 9:38

PGDev · Accepted Answer · 2019-11-04 09:51:39Z

1

If suppose the ViewModelCourseTypeFilter instance is like,

let viewModel = ViewModelCourseTypeFilter(displayedCourseTypeFilter: [
    DisplayedCourseTypeFilter(titlesCourseType: "First", isSelectedType: true),
    DisplayedCourseTypeFilter(titlesCourseType: "Second", isSelectedType: false),
    DisplayedCourseTypeFilter(titlesCourseType: "Third", isSelectedType: true)
])

Then you can get all titlesCourseType values where isSelectedType = true like so,

let arr = viewModel.displayedCourseTypeFilter.compactMap({ $0.isSelectedType ? $0.titlesCourseType : nil })
print(arr) //["First", "Third"]

answered Nov 4, 2019 at 9:51

PGDev

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1 Comment

jo jo Over a year ago

@ PGDev. Is it work for huge arrays? for example 10000 items.

vinsent · Accepted Answer · 2019-11-04 10:54:34Z

0

use

let arr = viewModel.displayedCourseTypeFilter.filter { $0.isSelectedType }

better?

answered Nov 4, 2019 at 10:54

vinsent

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2 Comments

Eduardo Baitello Over a year ago

Code-only answers are generally frowned upon on this site. Could you please edit your answer to include some comments or explanation of your code? Explanations should answer questions like: What does it do? How does it do it? Where does it go? How does it solve OP's problem? See: How to anwser. Thanks!

vinsent Over a year ago

Oh, yeah, I am trying to do better.

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