Comparison Operators

Swift 4 supports all standard comparison operators of C language.

Equal to (a == b)
Not equal to (a != b)
Greater than (a > b)
Less than (a < b)
Greater than or equal to (a >= b)
Less than or equal to (a <= b)

Note: Swift 4 also provides two identity operators (=== and !==), which is used to test whether both object references refer to the same object instance.

Every comparison operator returns a Bool value to specify whether the statement is true or not.

== 1   // true because 1 is equal to 1
!= 1   // true because 2 is not equal to 1
> 1  // true because 2 is greater than 1
< 2  // true because 1 is less than 2
>= 1  // true because 1 is greater than or equal to 1
<= 1  // false because 2 is not less than or equal to 1

Comparison operators are used in conditional statement as if statement.

Example 1

let name = "world"
if name == "world" {
    print("hello, world")
} else {
    print("I am sorry. I don't recognize you")
}
// Prints "hello, world", because name is indeed equal to "world".

Output:

hello, world

Example 2

let name = "world"
if name == "JavaTpoint" {
    print("hello, world")
} else {
    print("I am sorry. I don't recognize you")
}
// Prints "I am sorry. I don't recognize you", because name is not equal to "world".

Output: