ios 如何在 Objective-C 中组合两个数组？
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How would I combine two arrays in Objective-C?
提问by Moshe
What is the Objective-C equivalent of the JavaScript concat()function?
JavaScriptconcat()函数的 Objective-C 等价物是什么？
Assuming that both objects are arrays, how would you combine them?
假设两个对象都是数组，你将如何组合它们？
回答by grahamparks
NSArray's arrayByAddingObjectsFromArray:is more-or-less equivalent to JavaScript's .concat()method:
NSArray'sarrayByAddingObjectsFromArray:或多或少等价于 JavaScript 的.concat()方法：
NSArray *newArray=[firstArray arrayByAddingObjectsFromArray:secondArray];
Note: If firstArrayis nil, newArraywill be nil. This can be fixed by using the following:
注意：如果firstArray为零，newArray则为零。这可以通过使用以下方法修复：
NSArray *newArray=firstArray?[firstArray arrayByAddingObjectsFromArray:secondArray]:[[NSArray alloc] initWithArray:secondArray];
If you want to strip-out duplicates:
如果要删除重复项：
NSArray *uniqueEntries = (NSArray *)[[NSSet setWithArray:newArray] allObjects];
回答by meaning-matters
Here's a symmetric & simple way by just beginning with an empty array:
这是一种对称且简单的方法，只需从一个空数组开始：
NSArray* newArray = @[];
newArray = [newArray arrayByAddingObjectsFromArray:firstArray];
newArray = [newArray arrayByAddingObjectsFromArray:secondArray];
回答by guru
For Swift version its like charm :
对于 Swift 版本，它的魅力在于：
let a = [1,2,3]
let b = [3,4]
let c = a + b
print(c)
