1. 1.1.3

    init(exactly:)

    Creates an integer from the given floating-point value, if it can be represented exactly.

    init?<T>(exactly source: T) where T : BinaryFloatingPoint

    Parameters

    source

    A floating-point value to convert to an integer.

    Overview

    If the value passed as source is not representable exactly, the result is nil. In the following example, the constant x is successfully created from a value of 21.0, while the attempt to initialize the constant y from 21.5 fails:

    let x = Int(exactly: 21.0)
    // x == Optional(21)
    let y = Int(exactly: 21.5)
    // y == nil