Extensions.md

Extensions

We use extensions to break up our code into logical groups, e.g. when separating code specifically for protocol conformance into its own extension.

Table of Contents:

• Extensions
  • Key Considerations
  • Example

Key Considerations

• Declare protocol conformance to a type as an extension in the same file as that type declaration, if possible.
• Declare an extension that will only be used in a single file, in the same file that will use it, e.g. an Array extension constrained to a specific type of element used elsewhere in that file.
• Declare general-purpose extensions for other frameworks in their own files.
  • Name the file in the format <Extended type>+<Word or phrase about the extension>, e.g. Array+MergeSort.swift.

Example

extension UITableView {
    /// Hides the empty cells at the bottom of the table view.
    func hideEmptyCellsFooter() {
        tableFooterView = UIView()
    }
}