Float data type stores low-precision decimal numbers such as 3.1, 3.14159 and 556.9. It is not used that often in Swift, partly because
Double is the default for these kinds of numbers (it has a higher precision), and partly because when you come across libraries that use regular floats they are more likely to want
Available from iOS 7.0 – learn more in my book
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This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.