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You can think of Subscript as a Method of a struct or class that is referenced using square brackets john["name"].
For each subscript you need to define
● Data Type that is used for the index (Input Parameter)
● Data Type that is returned (Return Value)
In below example we use subscript as alternative way of accessing fields: john["name"], john["position"].
Test.swift
//DECLARE CLASS.
class Employee {
//DECLARE STORED PROPERTIES.
var name = "unknown"
var position = "unknown";
//DECLARE SUBSCRIPT.
subscript (index: String) -> (String) {
get {
switch (index) {
case "name" : return name
case "position" : return position
default : return "unknown index";
}
}
set (newValue) {
switch (index) {
case "name" : name = newValue
case "position" : position = newValue
default : print("unknown index");
}
}
}
}
//CREATE OBJECT.
var john = Employee()
//USE SUBSCRIPTS TO STORE DATA INTO FIELDS.
john["name" ] = "Bob"
john["position"] = "Manager"
//USE SUBSCRIPTS TO RETRIEVE DATA FROM FIELDS.
print(john["name" ])
print(john["position"])
