Swift - new array based on result of comparing values of two arrays

Question

idsArr = [ "id12345", "id27891", "id98654"]
idsNameIntvalueArr = [["id22913", "Peter Parker", 15], ["id12345", "Donald Duck", 6], ["id98654", "Mickey Mouse", 9], ["id112233", "Lion King", 9]]

I'm new in Swift, please give me advice, what is the best practice to compare this 2 arrays by id, if id matches, need to make new array with "name" and Int value, in this case:

resultArr = [["Donald Duck", 6],["Mickey Mouse", 9]]

Thanks.

FYI - it's a really poor design to use an array to hold a collection of data. You should declare a struct that has the three properties of id, name, and value. Then use an array of those struct. — rmaddy
– rmaddy, Commented Jul 15, 2017 at 17:04

Mo Abdul-Hameed · Accepted Answer · 2017-07-15 16:56:52Z

1

You can do that like this:

let resultArr = idsNameIntvalueArr.filter({ idsArr.contains($0[0] as! String) }).map({ [$0[1], $0[2]] })

First, you need to filter the array to include only the members whose IDs exists in idsArr.

Then, after filtering the array you need to create sub-arrays that contains only the name and age, and this is what map does.

answered Jul 15, 2017 at 16:56

Mo Abdul-Hameed

6,1102 gold badges26 silver badges38 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Mo Abdul-Hameed Over a year ago

You're welcome, and it's important to take @rmaddy advice seriously, good luck.

mramosch Over a year ago

It‘s my first time using Swift Arrays, too. I do have two Arrays of Strings (myArray1 and myArray2) and need (1) a myResultArray1, that holds only Strings that are present in both Arrays (myArray1 and myArray2), in the same order like myArray1 (of course minus the missing strings that are not included in both arrays) - and (2) a second myResultArray2, that holds the strings only available in myArray2 (which essentially is: myArray2 - myResultArray1). Do you do this with .filter or is there another API on Array for doing what I intend to do?

Collectives™ on Stack Overflow

Swift - new array based on result of comparing values of two arrays

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related