The squareRoot() method returns the square root of the given value. 
Example
// return the square root of 4
var result = 4.squareRoot()
print(result)
// Output: 2.0
squareRoot() Syntax
The syntax of the double squareRoot() method is:
num.squareRoot()
Here, num is the number whose square root is to be calculated.
squareRoot() Parameters
The squareRoot() method doesn't take any parameter.
squareRoot() Return Values
- returns the square root of the 
num. 
Example: Swift Double squareRoot()
// square root of 9
var result1 = 9.squareRoot()
print(result1)
// square root of 54.7
var result2 = 54.7.squareRoot()
print(result2)
// square root of 0
var result3 = 0.squareRoot()
print(result3)
Output
3.0 7.395944834840239 0.0
In the above example, we have used the squareRoot() method to find the square root of the given numbers.