how to prevent arraylist from adding the same string twice? [duplicate]

Question

I have a viewController that has a variable and it's getting the value of this variable from another view controller so the variable is like this for example..

var name = "Step-Up to Emergency Medicine"

and there is a button when clicked it's append this string to an arraylist

@IBAction func add(_ sender: Any) {
        myArray.append(name)
}

my question is how to prevent the arraylist from adding the same string value twice?

West1 · Accepted Answer · 2021-05-08 19:11:54Z

1

Make sure the string isn't already in the array before appending, like this:

@IBAction func add(_ sender: Any) {
   if !myArray.contains(name) {
       myArray.append(name)
   }
}

answered May 8, 2021 at 19:11

West1

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1 Comment

Leo Dabus Over a year ago

Better to use a set but if your list contains just a few elements you won't notice any difference.

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