Swift Array remove only one item with a specific value

Question

Alright, this should not be too difficult, but Sunday morning proves me wrong...

I have an Array with structs, and want to remove only one struct that matches its name property to a String. For example:

struct Person {
   let name: String
}

var myPersons =
[Person(name: "Jim"),
 Person(name: "Bob"),
 Person(name: "Julie"),
 Person(name: "Bob")]

func removePersonsWith(name: String) {
   myPersons = myPersons.filter { $0.name != name }
}

removePersonsWith(name: "Bob")
print(myPersons)

results in:

[Person(name: "Jim"), Person(name: "Julie")]

But how do I only remove one Bob?

tell me what differentiates between the two Bobs, then I'll tell you how. But if not, you can set a bool flag so once the filter is set to false it would exit the loop — mfaani
– mfaani, Commented Dec 4, 2016 at 16:05
The two Bobs are exactly the same, they are clones of each other, but I only want to remove one of them. — koen
– koen, Commented Dec 4, 2016 at 16:06
I'm just curious that why are you up to such functionality? Is it to remove duplicates? Or something else? — mfaani
– mfaani, Commented Dec 4, 2016 at 16:13
Person is just an example. I could have used a different example, eg balls with different colors, and then remove one red ball. Or fish in a river, and catch (remove) one salmon, etc. — koen
– koen, Commented Dec 4, 2016 at 16:18

vadian · Accepted Answer · 2023-01-20 17:04:25Z

7

filter filters all items which match the condition.

firstIndex returns the index of the first item which matches the condition.

  func removePersonsWith(name: String) {
      if let index = myPersons.firstIndex(where: {$0.name == name}) {
          myPersons.remove(at: index)
      }
  }

However the name of the function is misleading. It's supposed to be removeAPersonWith ;-)

edited Jan 20, 2023 at 17:04

answered Dec 4, 2016 at 16:07

vadian

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5 Comments

mfaani Over a year ago

I don't think this is what the OP eventually wants. He wants to erase all but one ie if he has 5 Bobs, he would want to remove 4 of them, this on removes 1 of them. Koen, please let us know what you want. Otherwise good answer

koen Over a year ago

No, I only want to remove one Bob

Allan Spreys Over a year ago

In terms of naming, I would call the method removeFirstPersonWith(name: String) to make it a little more clear.

vadian Over a year ago

@AllanSpreys I mentioned the ambiguity in the answer.

Allan Spreys Over a year ago

Yes, I know :) I’m recommending an alternative to those who find the answer helpful.

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