Swift

Front 1

What are the new feature of swift?

Back 1

1. Type Inference
2. Switch Statement Enhancements
3. Tuples
4. Closures(lambdas)
5. Optionals
6. Dictionary Type
7. Array String and Dictionary Value Types
8. Array Bounds Checking
9. Class like struct and enum values
10. Functions with multiple return values(via tuples)
11. Generics
12. Operator Overloading
13. Overflow Checking in integer calculations
14. String Interpolation
15. Nested Types
16. Nested Functions

Front 2

Describe the type Inference feature in Swift.

Back 2

Inferring the type of a variable by it value.

Front 3

Describe the switch statement enhancements

Back 3

Swifts switch statements can test values of any type

Front 4

What are swifts access modifiers?

Back 4

1. public
   
2. internal
3. private

Front 5

Describe the public access modifier.

Back 5

A class that’s declared public can be reused in other apps

Front 6

Describe the internal access modifier.

Back 6

A class that's declared internal can only be used by code in the same project

Front 7

Describe the private access modifier.

Back 7

A class thats declared private can only be used in the file for wich it is defined.

Front 8

What are swifts stored properties?

Back 8

Stored properties are basically instance variables with getter and setters built in

Front 9

How would you define a variable whose property is public but it can only be set by the file in wich it is defined

Back 9

public private(set) var balance: Double = 0.0

Front 10

Can initializers return values?

Back 10

No

Front 11

what is the shortcut for the quick help key

Back 11

option + click on item

Front 12

What is the shortcut for jump to Definition functionality

Back 12

control + click on item

Front 13

What is a value type?

Back 13

A value-type constant’s or variable’s value is copied when it’s passed to or returned from a function or method, when it’s assigned to another variable or when it’s used to initialize a constant.

Front 14

What is a reference type?

Back 14

A constant or variable of a reference type (often called a reference) is said to refer to an object. Conceptually this means that the constant or variable stores the object’s location. Unlike Objective-C, C and C + +, though, that location is not the actual memory address of the object, rather it’s a handle that enables you to locate the object so you can interact with it.

Front 15

Do objects assigned to constants make the objects constant?

Back 15

No the contant just will always point to the same object

Front 16

How do you compare reference types

Back 16

=== and !===

Front 17

what is this operator (...)

Back 17

That is the closed range operator, creates a sequential collection. It is called closed because both ends have a discrete value. 10 ... 20

Front 18

What are the patterns a case statement can include?

Back 18

• a single value or object of any type
  
• a comma separated list of values
• a closed range or half open range
• Tuples
• various combinations of these patterns in a comma separated list

Front 19

Describe a while loop

Back 19

a while loop continues till something is false

Front 20

Desribe the do while loop

Back 20

The do... while statement tests the loop-continuation condition after executing the loop’s body; therefore, the body always executes at least once.

Front 21

What is the swifts global function stride?

Back 21

stride(from: 11, through:1, by:-2)

From 11 to 1 iterating -2 down