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I am using the function .firstIndex to locate a specific substring in an array of arrays. But when I put the entire string, it works, but if I put only a substring of that string, this doesn't work.

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let index = programArray.firstIndex(where: {$0.contains("2021-14-09")}) //Index is nil => bad
let index = programArray.firstIndex(where: {$0.contains("2021-14-09 08:00:00")}) // Index is 0 => good

If i use it not in the firstIndex function it works, it is strange...

let test = "2021-14-09 08:00:00"
let test2 = test.prefix(10).contains("2021-14-09") // true => good

How can I do?

ΩlostA
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1 Answers1

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You use contains(_:), but if you look into the Apple Developer Documentation you see:

Returns a Boolean value indicating whether the sequence contains the given element.

So the whole string has to match if you use contains.

Schulze Thomas
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