iOS Development

Question 1

Core Data

Answer 1

allows us to take the objects we have created and save them into an internal database.

Question 2

core data entity

Answer 2

The same as a class,

created in xcdatamodeld file

Question 3

ManagedObjectContext

Answer 3

acts as a bridge from app to database

Question 4

Set initial view controller

Answer 4

View controller > Attributes > View Controller > Check off “Is initial View Controller”

Question 5

continue

Answer 5

tells our for loop to skip a value if

Question 6

break

Answer 6

breaks out of a loop if a specific condition is met

Question 7

What is a Dictionary in swift?

Answer 7

An unordered collection of paired data. The paired data is commonly referred to as a key-value pair in which a key is a unique identifier for their associated value.

Question 8

What do you call a dictionary with no key-value pairs?

Answer 8

An Empty Dictionary

Question 9

what are if-let statements used for

Answer 9

To check if a real value exists inside of an optional. If the value exists, the optional will be unwrapped and assigned to a variable.

Question 10

the ___ operator has higher precedence over the ___ operator

Answer 10

&&, ||

Question 11

Instead of relying on the compiler to set operator precedence, we can do so ouselves with _____

Answer 11

Parentheses

Question 12

with regards to logical operators, in an ___ statement true takes priority over false but in a ___ statement false takes priority over true

Answer 12

||, &&

Question 13

The logical __ operator returnes true only when both operands are true, it returns false in all other cases.

Answer 13

&&

Question 14

The logical __ operator returns true when either operands are true. when both operands are false, the logical expression evaluates to false

Answer 14

||

Question 15

The logical __ operator translates to NOT and negates a Boolean value

Answer 15

!

Question 16

inout

Answer 16

If you want a function to modify a parameter's value, you need to define the parameter as in-out parameter. You write an in-out parameter by placing the inout keyword right before a parameter's type. Behind the scenes, an in-out parameter has a value that is passed into the function, is modified by the function, and is passed back out of the function to replace the original value. Therefore the value passed in the function call cannot be a constant. You must declare it as a variable. The syntax of function with inout parameter is:
func funcname(parameterName:inout Type) -> Return Type {
    //statements
}

Question 17

What does swift “Control Flow” do?

Answer 17

It controls the flow of program execution. The term is used to describe the logic that dictates the execution path that is taken through the source code of an application as it runs.

Question 18

With regards to control flow what is “looping control”?

Answer 18

How often code is executed

Question 19

With regards to control flow what is “conditional control flow”?

Answer 19

Whether code is executed

Question 20

With regards to closure syntax, what does the “in” keyword indicate?

Answer 20

The start of the closure expression code.

Question 21

in reality functions are just named _____ expressions

Answer 21

closure

Question 22

In traditional computer science, what is a “closure” considered to be?

Answer 22

The combination of a self-contained block of code and one or more variables that exist in the context surrounding the code block.

Question 23

What data types are currently able to be used as keys in a Swift dictionary?

Answer 23

String, Int, Double, and Bool