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Apple Swift Development II -Unit 3 Vocabulary (part 1)

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Optional Binding

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Date created

Mar 1, 2020

Cards (25)

Section 1

(25 cards)

Optional Binding

Front

The process of attempting to assign an optional value to a constant in a conditional statement to see if the optional contains an underlying value.

Back

Local Scope

Front

A local variable has been defined within a specific block of code, or within the program.

Back

Enum

Front

This keyword declares a type made up of a group of related choices.

Back

Type Inspection

Front

Is used to determine, or check, the specific type of data.

Back

Nested optional

Front

An optional properties (like a box within a box).

Back

Optional Chaining

Front

Allows you to work with nested optional that are conditionally unwrapped.

Back

Variable Shadowing

Front

This occurs when a variable declared within a local scope has the same name as a variable declared in a global scope.

Back

Nil

Front

Indicates that a value is missing.

Back

Case

Front

In an enum, this keyword declares a name for one of the enum's options. In a switch, this keyword introduces a pattern to try to match a value against.

Back

AnyObject

Front

This object can represent any class within Swift, but not a structure.

Back

Guard-let

Front

Using this statement for requirements improves the readability of your code, as opposed to using an if statement for the same check.

Back

Failable initializer

Front

Refers to an initializer that may fail and will return nil as a result.

Back

Global Scope

Front

This variable has been defined at the top-level scope, of a program.

Back

Conditional Cast

Front

An instance to the specified type only if it's possible to do so.

Back

Downcast

Front

Using this can canst an object to a more specific type.

Back

Force-unwrap

Front

You will use this operator (!) after an optional value to access its underlying value.

Back

Optional

Front

A value that contains either an underlying value or nil )to indicate that the value is missing).

Back

As?

Front

A conditional cast operator that attempts to downcast the value to a more specific type and store it in a new constant or variable.

Back

Any

Front

As the name implies, can represent an instance of any type: string, doule, function, or whatever.

Back

Scope

Front

A type, variable, constant or function is accessible only within the scope it was assigned. By adding a pair of curly braces ({ }) for a function, an if statement, or a for loop, you're specifying the area within the braces.

Back

Implicitly unwrapped optional

Front

an optional that can also be used like a nonoptional value

Back

Type Casting

Front

A way to check the type of an object, or to treat that object as a different superclass or subclass from somewhere else in its own class hierarchy.

Back

Default

Front

This option is selected when no other option is available. In a switch statement, this block is executed if none of the other more-specific cases matches the input. In an if statement, this option is the final else clause.

Back

Guard

Front

This statement declares a conditional that must be true in order for the code after the guard statement to be executed.

Back

As!

Front

Is a forced form of a type cast operator. This version will force the downcast to the specified type.

Back