Subscripts in Swift allow accessing elements in a collection by their index or key. The subscript operator [] is used to define subscripts on types to allow customized access to elements similar to array indexing. Subscripts can have a getter and setter to retrieve or set values and are commonly used with dictionaries to access values by their keys.

1. swift 0x0c
subscripts
문현진(arnold@css99.co.kr)

2. subscript
[] = subscript operator

3. subscript syntax
subscript(index: Int) -> Int {
get {
}
set(newValue) {
}
}

4. subscript usage
var numberOfLegs = [ “spider”:8, “ant”:6”, “cat”:4]
numberOfLegs[“bird”] = 2

5. subscript options