iPhone Get Index of an array from Value in a Key

Question

I have the next NSMutableArray:

Product[0] {
    name => val1, 
    Price => pricevalue 1
}

Product[1] {
    name => val2, 
    Price => pricevalue2
}

I want to search for: name = val2 and return the index of product, so 1.

There are ways to do it that require fewer lines of code, but no way more efficient than the straight-forward loop which you can easily code yourself. There's no need to look for "clever" ways to do something if you can do it yourself, reasonably efficiently, with simple, straight-forward loops and if statements. — Hot Licks
– Hot Licks, Commented Jan 2, 2014 at 12:52

Zen · Accepted Answer · 2014-01-02 09:40:06Z

1

Use like this

NSIndexSet *indices = [array 
                       indexesOfObjectsPassingTest:^(id obj, NSUInteger idx, BOOL *stop) {
                       return [[obj objectForKey:@"name"] isEqualToString:@"val2"];
}];

Happy coding.........

edited Jan 2, 2014 at 9:40

Zen

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answered Jan 2, 2014 at 9:33

Ravindra Singh

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Comments

Léo Natan · Accepted Answer · 2014-01-02 18:02:21Z

1

__block NSUInteger index = NSUIntegerMax;

[products enumerateObjectsUsingBlock: ^ (Product* product, NSUInteger idx, BOOL* stop) {
    if([product.name isEqualToString:@"val2"])
    {
        index = idx;
        *stop = YES;
    }
}];

Edit: Ravindra's solution is more elegant!

edited Jan 2, 2014 at 18:02

answered Jan 1, 2014 at 18:33

Léo Natan

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