Generic Type Method


Returns a random value within the specified range, using the given generator as a source for randomness.


static func random<T>(in range: Range<Float80>, using generator: inout T) -> Float80 where T : RandomNumberGenerator



The range in which to create a random value. range must be finite and non-empty.


The random number generator to use when creating the new random value.

Return Value

A random value within the bounds of range.


Use this method to generate a floating-point value within a specific range when you are using a custom random number generator. This example creates three new values in the range 10.0 ..< 20.0.

for _ in 1...3 {
    print(Double.random(in: 10.0 ..< 20.0, using: &myGenerator))
// Prints "18.1900709259179"
// Prints "14.2286325689993"
// Prints "13.1485686260762"

The random(in:using:) static method chooses a random value from a continuous uniform distribution in range, and then converts that value to the nearest representable value in this type. Depending on the size and span of range, some concrete values may be represented more frequently than others.