Check if array contains part of a string in Swift?

Question

I have an array containing a number of strings. I have used contains() (see below) to check if a certain string exists in the array however I would like to chec

Answer 1

Try like this.

Swift 3.0

import UIKit

let itemsArray = ["Google", "Goodbye", "Go", "Hello"]

var filterdItemsArray = [String]()


func filterContentForSearchText(searchText: String) {
    filterdItemsArray = itemsArray.filter { item in
        return item.lowercased().contains(searchText.lowercased())
    }
}

filterContentForSearchText(searchText: "Go")
print(filterdItemsArray)

Output

["Google", "Goodbye", "Go"]

Answer 2

If you are just checking if an item exists in a specific array, try this:

var a = [1,2,3,4,5]

if a.contains(4) {
    print("Yes, it does contain number 4")
}
else {
    print("No, it doesn't")
}

Answer 3

First of all, you have defined an array with a single string. What you probably want is

let itemsArray = ["Google", "Goodbye", "Go", "Hello"]

Then you can use contains(array, predicate) and rangeOfString() – optionally with .CaseInsensitiveSearch – to check each string in the array if it contains the search string:

let itemExists = contains(itemsArray) {
    $0.rangeOfString(searchToSearch, options: .CaseInsensitiveSearch) !=  nil
}

println(itemExists) // true 

Or, if you want an array with the matching items instead of a yes/no result:

let matchingTerms = filter(itemsArray) {
    $0.rangeOfString(searchToSearch, options: .CaseInsensitiveSearch) !=  nil
}

println(matchingTerms) // [Google, Goodbye, Go]

Update for Swift 3:

let itemExists = itemsArray.contains(where: {
    $0.range(of: searchToSearch, options: .caseInsensitive) != nil
})
print(itemExists)

let matchingTerms = itemsArray.filter({
    $0.range(of: searchToSearch, options: .caseInsensitive) != nil
})
print(matchingTerms)

Answer 4

In Swift 5 with better readability :

let itemsArray = ["Google", "Goodbye", "Go", "Hello"]
let searchString = "Googled"

let result = itemsArray.contains(where: searchString.contains)
print(result) //prints true in the above case.

Answer 5

func filterContentForSearchText(_ searchText: String) {
   filteredString = itemsArray.filter({( item : String) -> Bool in
            return  item.lowercased().contains(searchText.lowercased())
    })
}

Answer 6

I had the same problem recently, didn't like most of these answers, solved it like this:

let keywords = ["doctor", "hospital"] //your array

func keywordsContain(text: String) -> Bool { // text: your search text
    return keywords.contains { (key) -> Bool in
        key.lowercased().contains(text.lowercased())
    }
}

This will also correctly trigger searches like "doc", which many of the above answers do not and is best practice. contains() is more performant than first() != nil source: https://www.avanderlee.com/swift/performance-collections/