Concatenate one NSMutableArray to the end of another NSMutableArray
A simple answer to this super simple question would be great! Here is the pseudcode:
NSMutableArray *Africa = [Lion, Tiger, Zebra];
NSMutableArray *Canada = [Polar Bear, 开发者_运维知识库Beaver , Loon];
NSMutableArray *Animals = *Africa + *Canada;
What I want to end up with:
Animals = [Lion, Tiger, Zebra, Polar Bear, Beaver, Loon];
What is the proper syntax to achieve this in Objective-C/ Cocoa?
Thanks so much!
To create an array:
NSMutableArray* africa = [NSMutableArray arrayWithObjects: @"Lion", @"Tiger", @"Zebra", nil];
NSMutableArray* canada = [NSMutableArray arrayWithObjects: @"Polar bear", @"Beaver", @"Loon", nil];
To combine two arrays you can initialize array with elements of the 1st array and then add elements from 2nd to it:
NSMutableArray* animals = [NSMutableArray arrayWithArray:africa];
[animals addObjectsFromArray: canada];
Based on Vladimir's answer I wrote a simple function:
NSMutableArray* arrayCat(NSArray *a, NSArray *b)
{
NSMutableArray *ret = [NSMutableArray arrayWithCapacity:[a count] + [b count]];
[ret addObjectsFromArray:a];
[ret addObjectsFromArray:b];
return ret;
}
but I haven't tried to find out if this approach is faster or slower than Vladimir's
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