How to find max value for Double and Float in Swift

Question

Current learning Swift, there are ways to find max and min value for different kind of Integer like Int.max and Int.min

Answer 1

Works with swift 5

public extension Double {

    /// Max double value.
    static var max: Double {
        return Double(greatestFiniteMagnitude)
    }

    /// Min double value.
    static var min: Double {
        return Double(-greatestFiniteMagnitude)
    }
}

Answer 2

All of them with using swift 5.

Answer 3

AV's answer is fine, but I find those macros hard to remember and a bit non-obvious, so eventually I made Double.MIN and friends work:

extension Double {
    static var MIN     = -DBL_MAX
    static var MAX_NEG = -DBL_MIN
    static var MIN_POS =  DBL_MIN
    static var MAX     =  DBL_MAX
}

Don't use lowercase min and max -- those symbols are used in Swift 3.

Answer 4

As of Swift 3+, you should use:

CGFloat.greatestFiniteMagnitude
Double.greatestFiniteMagnitude
Float.greatestFiniteMagnitude

Answer 5

Also CGFloat.infinity, Double.infinity or just .infinity can be useful in such situations.

Answer 6

Just Write

    let mxFloat = MAXFLOAT

You will get maximum value of float in swif.