Zero Usage.md

Zero Usage

How do we use zero?

zero exists as a representation of the zero value of a given structure or primitive such as CGPoint or Int.

• zero should never be used as an extension on a primitive such as Int or Double. Instead, use the raw 0 value.
• zero should be used on non-primitive types such as CGPoint or NSDecimalNumber.

Key Considerations

• By making a distinction on when to use zero, it allows for easier comprehension of code. At quick glance, seeing a 0 representation can relate to the reader that the type that is being dealt with is a primitive, vs. seeing a zero implying a non-primitive.

Code Example

let point: CGPoint = .zero  // ✅
let integer: Int = 0 // ✅
let rect: CGRect = .zero // ✅

let point = CGPoint(x: 0, y: 0) // 🛑
let integer: Int = .zero // 🛑
let rect = CGRect(x: 0, y: 0, width: 0, height: 0) // 🛑