-(_:_:)

lhs: A numeric value.
rhs: The value to subtract from lhs .

Subtracts one value from another and produces their difference, rounded to a representable value.

Declaration

static func - (lhs: Float, rhs: Float) -> Float

The subtraction operator (-) calculates the difference of its two arguments. For example:

let x = 7.5
let y = x - 2.25
// y == 5.25

The - operator implements the subtraction operation defined by the IEEE 754 specification.