The isLessThanOrEqualTo() method checks if one number is less than or equal to another or not.
Example
// check if 10 is less than or equal to 10 or not
var result = 10.isLessThanOrEqualTo(10)
print(result)
// Output: true
isLessThanOrEqualTo() Syntax
The syntax of the isLessThanOrEqualTo() method is:
num.isLessThanOrEqualTo(otherNumber)
Here, num is a number.
isLessThanOrEqualTo() Parameters
The isLessThanOrEqualTo() method takes one parameter
otherNumber- the value to test
isLessThanOrEqualTo() Return Values
The isLessThanOrEqualTo() method returns boolean value
true- ifnumis less than or equal tootherNumberfalse- ifnumis greater thanotherNumber
Example 1: Swift Double isLessThanOrEqualTo()
// check if 4 is less than or equal to 2 or not
var result1 = 4.isLessThanOrEqualTo(2)
print(result1)
// check if 2.0 is less than or equal to 2 or not
var result2 = 2.0.isLessThanOrEqualTo(2)
print(result2)
Output
false true
Here, since 4 is not less than or equal to 2, the isLessThanOrEqualTo() method returns false. However, 2.0 is equal to 2, the method returns true. 
Example 2: Using if…else With isLessThanOrEqualTo()
// check if 100 is less than or equal to 90 or not 
if 100.isLessThanOrEqualTo(90) {
  print("The condition is true")
}
else {
  print("The condition is false")
}
Output
The condition is false
Here, since 100 is less than or equal to 90, the condition is false so the code inside the else block is executed.