Detect if string contains any element of a string array

Question

How would I detect if a string contains any member of an array of strings (words)?

Here is the array:

let str:String = "house near the beach"
 let wordGroups:[String] = ["beach","waterfront","with a water view","near ocean","close to water"]

The following is not compiling

let match:Bool = wordGroups.contains(where: str.contains)

Your code compiles for me (and returns true). What error are you getting? — John Montgomery
– John Montgomery, Commented Oct 8, 2018 at 23:13
'Call can throw but it is not marked with 'try' and the error is not handled' plus an unwrapping error.The compiler eventually accepted let match:Bool = self.wordGroups.contains(where: (str?.contains)!) — user1904273
– user1904273, Commented Oct 10, 2018 at 5:33
There's nothing in the question that should throw or need to be unwrapped, so I assume your real code is a little different and the problem is somewhere else. Be careful unless you're absolutely 100% certain str will never be nil. — John Montgomery
– John Montgomery, Commented Oct 10, 2018 at 17:07

Ramis · Accepted Answer · 2020-12-29 09:26:21Z

16

I am using String extension:

extension String {
    func contains(_ strings: [String]) -> Bool {
        strings.contains { contains($0) }
    }
}

Use case:

let str = "house near the beach"
let wordGroups = ["beach","waterfront", "with a water view", "near ocean", "close to water"]
let haveWord = str.contains(wordGroups)

edited Dec 29, 2020 at 9:26

answered Dec 29, 2020 at 9:17

Ramis

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Shehata Gamal · Accepted Answer · 2018-10-08 22:52:00Z

12

You can try

let str = Set("house near the beach")
let match = wordGroups.filter { str.contains($0) }.count != 0

answered Oct 8, 2018 at 22:52

Shehata Gamal

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Nikdemm · Accepted Answer · 2018-10-08 23:08:59Z

8

In additional to answer of @Sh_Khan, if you want match some word from group:

let str:String = "house near the beach"
let wordGroups:[String] = ["beach","waterfront","with a water view","near ocean","close to water"]
let worlds = wordGroups.flatMap { $0.components(separatedBy: " ")}
let match = worlds.filter { str.range(of:$0) != nil }.count != 0

answered Oct 8, 2018 at 23:08

Nikdemm

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1 Comment

Gargo Over a year ago

It is not effective to use filter because you need just first element which matches condition

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