I don't understand why it is coming.
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Jeff Wolski
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Rahul Gupta
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3What does the actual error message say? Force casting is asking for trouble. – luk2302 Dec 22 '16 at 14:42
2 Answers
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Are you sure that object for key "quantity"
is array of Doubles
? You force unwrapping results so make sure that it is [Double]

Rafał Wójcik
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Try this
guard let quantity: [Double] = salesByStateResponse.value(forKey: "quantity") as? [Double] else {
return
}

Arnaud Wurmel
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