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Swift 2 notes
Michael Hulse edited this page Feb 14, 2016
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Notes from Swift: Programming, Master's Handbook.
- Booleans:
True
orFalse
- Integers: Positive and negative whole numbers
- Characters: Single ASCII symbol or letter
- Floats: Decimal numbers.
- Strings: Characters in sequence
- Lists: Mutable sequence of individual elements:
[3, 1, 4, 9, 2]
,["Apple", "Banana", "Caramel"]
,[true, false, true, true]
(values are typically of the same data type) - Enumerations: Immutable sets of data values (values are the same data type)
- Itemizations: Combination of different data types to form a finite set:
[false, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, true]
// <- this is a single-line comment
/*
* <- this is a multi-line comment
*/
- Booleans must be lowercase
true, false
- Floats need to have
0
and a decimal place:0.12
(not.12
)
-
let
declares an immutable constant -
var
declares a mutable variable - Commas not required at end of lines
… are made up of atomic data and/or other composite structures.
These can be classes or structs.
Think of Classes as Blueprints for a house, and Objects as actual houses designed from the Blueprints.
- Classes = more flexible
- Structs = Quicker to load and access
// Class:
class fooClass {
let baz = 1
}
let test1:fooClass = fooClass()
print(test1.baz)
// Struct:
struct fooStruct {
let baz = 1
}
let test2 = fooStruct()
print(test2.baz)
… are variables that can be defined but do not require an initial value:
let fark:String?
// ... later:
fark = "hello"