Compactmap Swift 4 2021 »
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Swift 4.1 introduction of compactMap

I wanted to ensure I avoided dealing with migration errors/assistant as much as possible. Lucky for us, Swift is a powerful language. We can define an extension pactMap for any version below 4. Swift has had map and flatMap for a few versions now. However in Swift 4.1 you can no longer use flatMap over a sequence with a transformation closure that returns an optional value. Instead, now we have a dedicated method for this specific case, named compactMap. It might be a bit confusing at first to understand this change.

Use this method to receive an array of non-optional values when your transformation produces an optional value. In this example, note the difference in the result of using map and compact Map with a transformation that returns an optional Int value. For several versions Swift has mapand flatMap. However, in Swift 4.1, you can no longer apply flatMapto a sequence of values and still pass a closure, which returns an optional value. For this, there is now a method compactMap. At first it may not be so easy to understand the essence of innovation. Backward compatibility for `compactMap` in Swift 4.0. - shim-swift-4-1.swift. Above functions are all useful for collections array / dictionary pairs. The only reason I want to mention this is that compactMap is coming maybe in Swift 4.1 or 4.2 to replace flatMap, I just want to maybe give you a bit summary at the same time for all of them. Assuming we will be having an array, and I will give examples of the use of. CompactMap is a combination of map and filter. Learn how it takes a closure that returns some type. Like map it may be a different type from the collection originally contained. However, the return type of the closure is an Optional. So if the closure returns nil it filters it out. In that way, it maps and filters.

The compactMap method lets us transform the elements of an array just like map does, except once the transformation completes an extra step happens: all optionals get unwrapped, and any nil values get discarded. This is useful whenever you have an array of things you need to convert, but the. Qiskit in swift. Contribute to qiskit-community/qiskit-swift development by creating an account on GitHub. Swift 4.1 中引入了一个“新”函数 compactMap,在这里给大家介绍一个迁移的小技巧。 compactMap 的由来 在开始之前,先简单介绍一下 compactMap 的由来,我们都知道之前 flatMap 有两个重载版本,第一.

Swift Map, FlatMap CompactMap, Reduce,.

Swift 4 macht es besser und verbietet den parallelen Schreibzugriff auf Variablen siehe SE 0176 sowie das Ownership Manifesto. Wenn der Swift-4-Compiler Code entdeckt, durch den es zu einem parallelen Schreibzugriff kommen kann, löst er nun einen Fehler aus und Sie sind gezwungen, den Code zu ändern. Der einfachste Fall, bei dem das. Replacing flatMap With compactMap Feb 12, 2018 · 3 minute read Swift. Swift 4.1 ships with the still in beta Xcode 9.3 and brings more changes to the Swift language and the Swift standard library. Apple intends it as a source compatible upgrade to Swift 4.0 but I have hit one source code change that I am guessing will be widespread. Although Swift 4.1 brought many improvements to Swift, it was intended to be source compatiblewith Swift 4.0, so most improvements where purely additive. But one notable exception was therename from flatMap to compactMap. I always thought Swift’s old flatMap on arrays andother sequences was somewhat of an annoyance, as it never really was a. Difference between flatMap and compactMap in Swift. It seems like in Swift 4.1 flatMap is deprecated. However there is a new method in Swift 4.1 compactMap which is doing the same thing? With flatMap you can transform each object in a collection, then.

Swift 4 is now officially released! Swift 4 builds on the strengths of Swift 3, delivering greater robustness and stability, providing source code compatibility with Swift 3, making improvements to the standard library, and adding features like archival and serialization. You can watch a quick. Higher order functions in Swift: Filter, Map, Reduce, flatmap, compactMap Ever since I learned about functions and closures in detail, I wanted to know more about the advantages and usages of. Using map, filter or reduce to operate on Swift collection types such as Array or Dictionary is something that can take getting used to. Unless you have experience with functional languages your instinct may be to reach for the more familiar for-in loop. With that in mind here is my guide to using map, filter, reduce and flatMap and compactMap.

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