section2-operator

Operator Questions 1 ~ 3

1) What are the operators available in Swift?

Answer

Operators

• Arithmetic Operators (+,-,*,/,%)
• Logical Operators (<,>,<=,>=,!=,==)
• Conditional Operator (?:)
• Compound Operators (+=, -=, *=, /=, %=)
• Nil-Coalescing Operator (??)
• Type Checking Operator (is)
• Type Considering Operator (as!, as?)
• Identity Operators (===, !==)

Range Operators

• Closed Range (1...10)
• Half Opened Range (1..<10)
• One Sided Range Operators (2..)

2) Can you explain different range operators in Swift?

Answer

let n: Int = 3

// Closed Range
for i in 0...n {
  print(i) // 0, 1, 2, 3
}

// Half Opened Range
for i in 0..<n {
  print(i) // 0, 1, 2
}

// One Sided Range Operators
let numbers: [Int] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
for value in numbers[5...] {
  print(value) // 5, 6, 7, 8, 9, 10
}

3) What is identity operator in Swift?

Answer

• === and !== are the identity Operators in Swift. This is only used for Object Types. In other words, it's not used for Value Types.

class A {

}

let a1: A = A()
let a2: A = A()
let a3: A = a2

print(a1 === a2) // false
print(a2 === a3) // true, referencing the same memory

Table Of Contents

Section 1, Data Type

Section 2, Operator

Section 3, Conditional Statement

Section 4, Enum

Section 5, functions

Section 6, struct

Section 7, initializers

Section 8, closures

Section 9, OOP

Section 10, static type vs dynamic type

Section 11, optional

Section 12, generic

Section 13, subscript

Section 14, access specifier

Section 15, higher order function

Section 16, delegate

Section 17, extension

Section 18, Memory Management

Section 19, protocols

Section 20, collections

Section 21, KVO and KVC

Section 22, Exception Handling

Section 23, Framework

Section 24, Objective-C