IOS学习笔记---collections

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本文深入探讨了iOS与Android开发的核心技术，包括Objective-C与Swift在iOS开发中的应用，以及Kotlin与Java在Android开发中的重要性。同时，文章还介绍了Flutter与React Native等跨平台开发框架，以及Xcode与Android Studio作为主要IDE的使用技巧。通过对比不同技术栈的特点，旨在帮助开发者选择最适合自己的开发路径。

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Different types of collections organize their contained objects in distinctive ways:

1):NSArray and NSMutableArray—An array is an ordered collection of objects. You access an object by specifying its position (that is, its index) in the array. The first element in an array is at index 0 (zero).

2):NSSet and NSMutableSet—A set stores an unordered collection of objects, with each object occurring only once. You generally access objects in the set by applying tests or filters to objects in the set.

3):NSDictionary and NSMutableDictionary—A dictionary stores its entries as key-value pairs; the key is a unique identifier, usually a string, and the value is the object you want to store. You access this object by specifying the key.