如何检查数组中的句子在Swift中是否包含确切的单词？

Question

For example, I have the following arrays:

var reviews = ["Skating is good in Austria", 
"I loved the Spanish food, it had so many varieties and 
it was super super delicious. The price was a little bit high but 
it was worth it. People who don't like spicy food might need 
to think twice as it could be a little bit problematic for them.", 
"I didn’t like the Indian food!", 
"People were really friendly, I enjoyed being there."]

var words = ["Skating", "Food", "Climbing"]

Now I want to check, if these reviews contain one of my words.

The challenge is: One or more reviews can contain these words and I want to find these reviews, add them into an array and print.

For this I do:

var arr = [String]()

for review in reviews {
    for word in words {
        if review.containsString(word) {
            arr.append(review)
        }
    }
    print(arr)
}

but that prints only the first sentence:

["Skating is good in Austria"]

So, I want to check, if one or more reviews, contains on of these words from the array, then to put ALL these matched reviews into an arr array.

Can anyone help me with it? I'm confused why it take just one review and stop after

Answer 1

You need to move the print sentence out of your loop.

Like this:

var arr = [String]()

for review in reviews {
    for word in words {
        if review.containsString(word) {
            arr.append(review)
        }
    }
}
print(arr)

Also, if you don't want to get duplicate reviews, I would use a set instead of an array: var arr = Set<String>()

Also, it's probably the case that you need a case insensitive string comparison. Change Food by food in your words array and try again.

To get a full case insensitive loop working, try this:

for review in reviews {
    for word in words {
        if review.lowercaseString.containsString(word.lowercaseString) {
            arr.append(review)
        }
    }
}
print(arr)

Answer 2

If you want ignore case with string just try like this way using filter method of array , it will reduce your code of looping.

var predicateString = [String]()
for word in words {
    predicateString(String(format:"SELF CONTAINS[cd] %@", word)
}
let predicate = NSPredicate(format: "%@",predicateString.joined(separator: " || "));
let filteredArray = reviews.filter { predicate.evaluateWithObject($0) };
print(filteredArray)

Answer 3

You can use Functional Programming

First of all lets create an array of lowercase keywords (I assume you want case insensitive matching).

let keywords = words.map { $0.lowercaseString }

Next

let matchingSentences = reviews.filter { sentence  in
    let lowerCaseSentence = sentence.lowercaseString
    return keywords.contains { keyword in sentence.rangeOfString(keyword) != nil }
}

Result

matchingSentences.forEach { print($0) }

Skating is good in Austria
I loved the Spanish food, it had so many varieties and it was super super delicious. The price was a little bit high but it was worth it. People who don't like spicy food might need to think twice as it could be a little bit problematic for them.
I didn’t like the Indian food!

Shorter version

let res = reviews.filter { sentence in keywords.contains { sentence.lowercaseString.rangeOfString($0) != nil } }