Swift Double - isLess() Function

Quiz

The isLess() function is used to determine whether the specified value is less than the given value. This method works like the less-than operator (NaN (not a number), this method will return false because NaN is not less than nor greater than any value. Also, -infinity compares less than all values except −infinity and NaN, similarly for +infinity.

For example, we have two numbers: num1 = 10.3, num2 = 32.3. Now we can compare them and find the lower number using num1.isLess(than: num2), and this function will return true.

Syntax

Following is the syntax of the isLess() function −

   func isLess(than other: Double) -> Bool

Parameters

The other parameter represents the value that we want to compare with the given value.

Return Value

This function returns a boolean value. If the given value is less than the other, this function returns true. Otherwise, this method will return false.

Now we will discuss the usage of the isLess() function with the help of the following examples:

Example 1

Swift program to demonstrate the isLess() function. Here we will provide different types of inputs to the function to check how it behaves.

import Foundation

// Double Inputs
let value1 : Double = Double.infinity
let value2 : Double = 4.539202122
let value3 : Double = Double.nan
let value4 : Double = -3.32323232
let value5 : Double = 10.3

// Checking smallest values
// Using isLess() function
print("Is \(value1) is less than \(value2)?:", value1.isLess(than: value2))
print("Is \(value2) is less than \(value3)?:", value2.isLess(than: value3))
print("Is \(value2) is less than \(value4)?:", value2.isLess(than: value4))
print("Is \(value4) is less than \(value5)?:", value4.isLess(than: value5))
print("Is \(value2) is less than \(value5)?:", value2.isLess(than: value5))

Output

Is inf is less than 4.539202122?: false
Is 4.539202122 is less than nan?: false
Is 4.539202122 is less than -3.32323232?: false
Is -3.32323232 is less than 10.3?: true
Is 4.539202122 is less than 10.3?: true

Example 2

Swift program to determine the smallest value among the given values with the help of the isLess() function.

import Foundation

// Input 1
let num1 : Double = 4.539202122
let num2 : Double = 6.32323232

// Finding smallest values using isLess() function
if (num1.isLess(than: num2)){
   print("Yes! \(num1) is less than \(num2)")
}else{
   print("No! \(num1) is not less than \(num2)")
}

// Input 2
let num3 : Double = 390.21289483
let num4 : Double = 10.2332

// Finding smallest values using isLess() function
if (num3.isLess(than: num4)){
   print("Yes! \(num3) is less than \(num4)")
}else{
   print("No! \(num3) is not less than \(num4)")
}

Output

Yes! 4.539202122 is less than 6.32323232
No! 390.21289483 is not less than 10.2332

Example 3

Swift program to find the minimum element from the given array of doubles using the isLess() function.

import Foundation
// Function to find a minimum element from the given array
func findMinimumElement(arr: [Double]) -> Double {

   // Checking if the array is empty or not
   if arr.isEmpty {
      return 0.0
   }

   var minimumElement = arr[0]

   // Finding minimum element
   for x in arr.dropFirst() {
      if x.isLess(than: minimumElement) {
         minimumElement = x
      }
   }

   return minimumElement
}
let inputArray = [3.4, 6.7, 1.2, 0.4]
print("Minimum element is", findMinimumElement(arr: inputArray))

Output

Minimum element is  0.4

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