Foundations
What is Singleton?
A type that allows only one shared instance in the app. Useful for coordinators, sometimes overused for global state.
Learn this term every day on iPhone.
One hand-written term. A real workplace example. Thirty seconds before your day gets loud.
In real work
Singleton: Analytics.shared logs from anywhere, but we inject a mock in tests.
How is this different from Googling it?
Google gives a definition. Prompthaus pairs each term with how it shows up in standups, PRs, prompts, and design reviews—then quizzes you until the word sticks. One term a day on iPhone.