Swift

In Swift, you can use the guard statement to guard your code. The guard blocks access to critical parts of your code if a condition is not met. The guard statement works very similarly to an if statement. The main difference is that the guard statement is used to continue running code if a condition […]

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 –

Enums in Swift tie related values together in a type-safe way. For example, instead of calling a direction “Up” or “Down” in your program, you should create an enum that couples these options together: Then you can call Direction.Up or Direction.Down. A Common Use Case for Enums in Swift Say you have an app that needs to control the direction of the game character

Swift closure is a special type of function. Similar to regular functions, closures accept parameters, execute statements, and return values. According to Apple: Closures are self-contained blocks of functionality that can be passed around and used in your code In Swift, you can use closures as Swift Closures Let’s start by writing a closure to demonstrate how it works:

In Swift, a closure marked with @escaping means the closure can outlive the scope of the block of code it is passed into. In a sense, @escaping tells the closure to “stay up even after the surrounding function is gone”. But why is this useful? Let’s say you are performing an (asynchronous) network request such

In Swift, both Float and Double are used to represent decimal numbers. The difference between a Float and a Double is in the precision: As a rule of thumb, you should use a Double in Swift. Swift Defaults to Doubles By default, Swift uses Double when it faces a decimal number in the code. You

To pass a function as a parameter into another function in Swift, the accepted parameter type needs to describe a function. For instance, this function accepts two regular parameters and a function parameter: Now you can call this function by passing it an argument which is any function that takes two doubles and returns a

In Swift: In a sense, fileprivate means “private, but not in this file”. For example: This is the quick answer. However, there is a lot more you need to understand about private and fileprivate access control levels. Let’s take a deeper look at private and fileprivate access levels in Swift. Access Control Modifiers in Swift

To flatten a 2D array in Swift: 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 like this, you need repeat the above process as many times as there

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