What does this Objective-C dictionary code do?

Question

.h

@property (nonatomic, strong) NSMutableDictionary * products;  //not synthesized in .m

.m

- (void)productsRequest:(SKProduct         


        

Answer 1

You are having trouble understanding this line:

IAPProduct * product = _products[skProduct.productIdentifier];

Lets break it down:

NSString *key = skProduct.productIdentifier;
IAPProduct * product = _products[key];

The 2nd line is modern syntax for:

IAProduct * product = [_products objectForKey:key];

This is the normal way to lookup a value in a dictionary for a given key.