swift2 – Tarik Billa

How to remove multiple spaces in Strings with Swift 2

April 8, 2024 by Tarik

In Swift 2, join has become joinWithSeparator and you call it on the array. In filter, isEmpty should be called on the current iteration item $0. To replace whitespaces and newline characters with unique space characters as in your question: extension String { func condenseWhitespace() -> String { let components = self.componentsSeparatedByCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet()) return components.filter { … Read more

“Variable ‘xxx’ was never mutated; consider changing to ‘let’ constant” ERROR

December 2, 2023 by Tarik

You just need to remove var, making your code: for characteristic in service.characteristics ?? [] { print(str) _selectedPeripheral!.writeValue(str.dataUsingEncoding(NSUTF8StringEncoding)!, forCharacteristic: characteristic, type: CBCharacteristicWriteType.WithoutResponse) } because characteristic is immutable by default.

Swift 2: Immutable value X is never used consider replacing with ‘_’

August 8, 2023 by Tarik

These changes are recommended because if you don’t use these variables at all you should consider replacing it with ‘_’. So you (and other people) can later understand your intention more quickly. In terms of performance it would probably be just a minor improvement which you can’t notice at all. The same situation applies during … Read more

Extension of a nested type in Swift

May 31, 2023 by Tarik

It seems like this problem is related to SR-631. I’ve encountered similar a issue, I guess the complier is trying to process the file where you extend the nested class before the one where it’s defined. Therefore you have this error saying that that A has no member B. The solution I’ve found is to … Read more

Swift: How to use for-in loop with an optional?

April 12, 2023 by Tarik

If set of operations to be applied to all elements of the array, it is possible to replace for-loop with forEach{} closure and use optional chaining: var arr: [Int]? = [1, 2, 3] arr?.forEach{print($0)}

Using the split function in Swift 2

February 25, 2023 by Tarik

split is a method in an extension of CollectionType which, as of Swift 2, String no longer conforms to. Fortunately there are other ways to split a String: Use componentsSeparatedByString: “ab cd”.componentsSeparatedByString(” “) // [“ab”, “cd”] As pointed out by @dawg, this requires you import Foundation. Instead of calling split on a String, you could … Read more

Swift’s guard keyword

October 17, 2022 by Tarik

Reading this article I noticed great benefits using Guard Here you can compare the use of guard with an example: This is the part without guard: func fooBinding(x: Int?) { if let x = x where x > 0 { // Do stuff with x x.description } // Value requirements not met, do something } … Read more