Question

How to convert a decimal string to a double in Swift

Answer 1

import Foundation

let s = "12.34"

let d = Double(s)  

print("String value: \(s)")
print("Double value: \(String(describing: d))")


/*
run:

String value: 12.34
Double value: Optional(12.34)

*/

 

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Answer 2

import Foundation

let s = "12.34"

if let d = Double(s) { .. safely
    print("String value: \(s)")
    print("Double value: \(String(describing: d))")
}


/*
run:

String value: 12.34
Double value: 12.34

*/

 

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