swift_sentiment.swift

// Sentiment Analysis
// Set up our input
let input = "I hate this apple pie."

// Feed it into the NaturalLanguage framework
let tagger = NLTagger(tagSchemes: [.sentimentScore])
tagger.string = input

// Ask for the results
let sentiment = tagger.tag(at: input.startIndex, unit: .paragraph, scheme: .sentimentScore).0

// Read the sentiment back and print it
let score = Double(sentiment?.rawValue ?? "0") ?? 0

// Print the right smiley based on sentiment
if score == 0{
    print("🙂")
}
else if score < 0{
    print("😢")
}
else {
    print("😁")
}

// Print the final sentiment score
print("The sentiment score is: \(score)")