82 lines
1.6 KiB
Objective-C
82 lines
1.6 KiB
Objective-C
//
|
|
// Pair.m
|
|
// Cog
|
|
//
|
|
// Created by Eric Hanneken on 2/13/08.
|
|
// Copyright 2008 Vincent Spader. All rights reserved.
|
|
//
|
|
|
|
#import "NSArray+ShuffleUtils.h"
|
|
|
|
|
|
@implementation NSArray (ShuffleUtils)
|
|
|
|
/*
|
|
* Generates an array of random long integers in the range
|
|
* 0 to (2**31) - 1. The length of the array is determined
|
|
* by the count parameter.
|
|
*/
|
|
+ (NSArray *) arrayWithRandomLongs:(NSUInteger) count
|
|
{
|
|
NSMutableArray* randomLongs = [NSMutableArray arrayWithCapacity:count];
|
|
NSUInteger i;
|
|
for (i = 0; i < count; ++i)
|
|
{
|
|
[randomLongs addObject:[NSNumber numberWithLong:random()]];
|
|
}
|
|
|
|
return randomLongs;
|
|
}
|
|
|
|
+ (NSArray *)zipArray:(NSArray*)x withArray:(NSArray *) y
|
|
{
|
|
NSUInteger xCount = [x count];
|
|
NSUInteger yCount = [y count];
|
|
NSUInteger minCount = (xCount < yCount) ? xCount : yCount;
|
|
NSMutableArray* pairs = [NSMutableArray arrayWithCapacity:minCount];
|
|
NSUInteger i;
|
|
for (i = 0; i < minCount; ++i)
|
|
{
|
|
NSArray* p = @[[x objectAtIndex:i], [y objectAtIndex:i]];
|
|
[pairs addObject:p];
|
|
}
|
|
|
|
return pairs;
|
|
}
|
|
|
|
+ (NSArray *) unzipArray:(NSArray*) pairs
|
|
{
|
|
NSMutableArray* first = [NSMutableArray arrayWithCapacity:[pairs count]];
|
|
NSMutableArray* second = [NSMutableArray arrayWithCapacity:[pairs count]];
|
|
|
|
for (NSArray *pair in pairs)
|
|
{
|
|
[first addObject:[pair first]];
|
|
[second addObject:[pair second]];
|
|
}
|
|
|
|
return @[first,second];
|
|
}
|
|
|
|
|
|
/*
|
|
* Compares two pairs by their first objects.
|
|
*/
|
|
- (NSComparisonResult) compareFirsts:(id) y
|
|
{
|
|
return [[self first] compare:[y first]];
|
|
}
|
|
|
|
- (id)first
|
|
{
|
|
return [self objectAtIndex:0];
|
|
}
|
|
|
|
- (id)second
|
|
{
|
|
return [self objectAtIndex:1];
|
|
}
|
|
|
|
|
|
@end
|