nscountedset | 易学教程

Confusion with distinct and indistinct object

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问题 I thought that NSCountedSet counted numB and numC twice in the frequency because they had the same value, so I created two Fraction objects (not shown) from my class Fraction , and I set their ivars ( numerator , denominator ) to equal each others but the countForObject: treated them as two distinct objects and counted their frequencies as one each. numA and numB pointed to different places in memory but share the same value, and the two Fraction objects pointed to different places in memory

To Get Duplicate as well as original items from an array in iOS

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问题 I have an array, as (John, Jane, John) I want to get duplicates,as well as original elements of array like (John,John) I am able to get single occurance from code here NSArray *names = [NSArray arrayWithObjects:@"John", @"Jane", @"John", nil]; NSCountedSet *set = [[NSCountedSet alloc] initWithArray:names]; for (id item in set) { NSLog(@"Name=%@, Count=%lu", item, (unsigned long)[set countForObject:item]); if((unsigned long)[set countForObject:item]>1){ NSLog(@"of repeated element-----=%@"

Most common array elements

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I need to find the most common (modal) elements in an array. The simplest way I could think of was to set variables for each unique element, and assign a count variable for each one, which increases every time it is recorded in a for loop which runs through the array. Unfortunately the size of the array is unknown and will be very large, so this method is useless. I have come across a similar question in Objective-C that uses an NSCountedSet method to rank the array elements. Unfortunately I am very new to programming, and could only translate the first line into Swift. The suggested method is

Most common array elements

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问题 I need to find the most common (modal) elements in an array. The simplest way I could think of was to set variables for each unique element, and assign a count variable for each one, which increases every time it is recorded in a for loop which runs through the array. Unfortunately the size of the array is unknown and will be very large, so this method is useless. I have come across a similar question in Objective-C that uses an NSCountedSet method to rank the array elements. Unfortunately I