Returns the square root of the value, rounded to a representable value.
SDK
- Xcode 9.0+
Framework
- Swift Standard Library
Declaration
func squareRoot() -> Double
Return Value
The square root of the value.
Discussion
The following example declares a function that calculates the length of the hypotenuse of a right triangle given its two perpendicular sides.
func hypotenuse(_ a: Double, _ b: Double) -> Double {
return (a * a + b * b).squareRoot()
}
let (dx, dy) = (3.0, 4.0)
let distance = hypotenuse(dx, dy)
// distance == 5.0