Operators in Swift3.0

Operator : An operator is a special symbol or phrase that you use to check, change, or combine values.Swift also provides two range operators (a..<b and a...b) not found in C.

Types of Operator in Swift 

1.  Unary
2.  Binary
3. Ternary

Unary: Unary operators operate on a single target. Unary prefix operators appear immediately before their target and unary postfix operators appear immediately after their target . Example

Unary prefix operator:   +a

Unary postfix operator:   a+

Binary: Binary operators operate on two targets (such as a + b) and are infix because they appear in between their two targets. 

Ternary: Ternary operators operate on three targets. Swift has only one ternary operator, the ternary conditional operator (a ? b : c) 

    

let x = 10
let y = 20
print("Largest number is \(x > y ? x : y)")

Output : 20 

Assigment Operator: The assignment operator (a = b) initializes the value of a with the value of b. Example

 a = b

Arithmetic Operators
Swift supports the four standard arithmetic operators for all number types:

• Addition (+)
• Subtraction (-)
• Multiplication (*)
• Division (/)

Remainder Operator

The remainder operator (a % b)

10 % 3 = 1 

Compound Assignment Operators
Swift provides compound assignment operators that combine assignment (=) with another operation. Example

var x = 10
x += 2

// x is now  12

*Note: The compound assignment operators do not return a value.

let z = x +=2

Comparison Operators: 

• 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)

Identity Operator  in Swift : Identity operator help us to test whether two object references both refer to the same object instance.

• ===
• !==

Nil-Coalescing Operator: The nil-coalescing operator (a ?? b) unwraps an optional a if it contains a value, or returns a default value b if a is nil.Example

let simulatorToken = "werjf123123kjsdjf"
var deviceToken: String?
let setDeviceToken = deviceToken ?? simulatorDeviceToken

Output =  werjf123123kjsdjf


Range Operators: 

• Closed Range Operator (a...b)
• Half - Open Range Operator (a..<b)

Closed Range Operator: The closed range operator (a...b) defines a range that runs from a to b, and includes the values a and b. The value of a must not be greater than b.   Example

 for i in (1...10){

   print (i)

}

Half - Open Range Operator: The half-open range operator (a..<b) defines a range that runs from a to b, but does not include b. 

let names = ["Macbook-proretina", "Macmini", "iMac", "Macbook-pro"]

for index  in  0  ..< names.count {

print (index)

}

Logical Operators:combine the Boolean logic values true and false.

• Logical NOT (!a)
• Logical AND (a && b)
• Logical OR (a || b)