In Swift: fileprivate means an entity that is accessible anywhere in that file. private means an entity that cannot be accessed anywhere except for the enclosing type, such as a class. In a sense, fileprivate means “private, but not in this file”. For example: Here number1 was successfully printed, because it is fileprivate and thus …
To flatten a 2D array in Swift: Call Array.joined() on an array. Convert the result to an array using Array(). For example: Output: Notice that this only flattens out one dimension. For example, if you have an array of arrays of arrays, the result is an array of arrays: Output: To flatten a multidimensional array …
In Swift, the underscore operator (_) represents an unnamed parameter/label. In for loops, using the underscore looping parameter is practical if you do not need the looping parameter in the loop. Output: In function calls, you can omit the argument label by adding a (_) in front of the argument in the implementation. Output: In …
Swift “_” Operator – When Use Underscore in Swift? Read More »
To convert a Date object to milliseconds and milliseconds to Date object in Swift, extend the built-in Date class: Example usage: Let’s take a detailed look at why we want to do it this way and what is the 1970 thing. How Does It Work In Swift, you can extend existing types using the extension …
Swift: Date() to Milliseconds and Milliseconds to Date() Read More »
In Swift, the self keyword refers to the object itself. It is used inside the class/structure to modify the properties of the object. You can assign initial values to properties in the init() method via self. For instance: In this guide, you learn what is self and when you should/should not use it. In addition, …
In Swift, you can implement custom types using classes. A class acts as a factory for creating objects. For example, let’s create a Fruit class and two Fruit objects: This is the quick answer to what is a class in Swift. But if you are unfamiliar with classes, there is so much more to learn. …
In Swift, you can implement custom types using structures. A structure acts as a factory for creating objects. For example, let’s create a Fruit structure and some Fruit instances of it: This is the quick answer for what is a structure in Swift. However, if you are unfamiliar with structures, there is so much more …
In Swift, there are no do…while loops that are common in other programming languages. Instead, there is a repeat…while loop that does the exact same thing. For instance: Output: The repeat block is always executed at least once no matter what. Let’s take a detailed guide about repeat…while loops in Swift. Repeat…While Loop in Swift …
In Swift, the map() function can be used to apply a function for each element in a collection. For example, let’s square an array of numbers: Output: Here is an illustration of how the above code works: In this guide, you learn how to use the map() function with closures on different collection types in …
In Swift, chained optional binding can lead to an “if let pyramid of doom” that looks like this: This is bad practice. However, there is a way to flatten this structure by: In this guide, you learn how to break the pyramids of doom using neater if-let statements and guard-let statements. Optional Binding in Swift …
‘if let’ Pyramid of Doom in Swift: How to Fix It Read More »
