CODEWITHSUNDEEP
iosobjective-cnsmutabledictionary
Tj3n
Tj3n

Reputation: 9923

Objective-C Quick way to compare and replace NSMutableDictionary value

I have 2 different length NSMutableDictionary like this:

Dic 1: {
0 = 22962;
10 = 11762;
11 = 11762;
12 = 11761;
13 = 11761;
2 = 11762;
3 = 11761;
4 = 11763;
5 = 11763;
6 = 11763;
7 = 11763;
8 = 11763;
9 = 11762;}

Dic 2: {
11756 = "<EPinObject: 0x17009f860>";
11761 = "<EPinObject: 0x17409f950>";
11757 = "<EPinObject: 0x1700973e0>";
11762 = "<EPinObject: 0x17409f9f0>";
11758 = "<EPinObject: 0x174280410>";
11763 = "<EPinObject: 0x17409fa40>";
11759 = "<EPinObject: 0x174280460>";
11760 = "<EPinObject: 0x1742804b0>";
22962 = "<EPinObject: 0x17409f9a0>";}

I want to make Dic 3 like this:

Dic 3: {
0 = "<EPinObject: 0x17409f9a0>";
10 = "<EPinObject: 0x17409f9f0>";
...
9 = "<EPinObject: 0x17409f9f0>";}

Dic 1 have similar value for diff key so i have to put like that

Right now im doing this by using 2 for-in but it seems takes too long and too many loops, i wonder if theres faster way to compare the value of dic1 with key of dic2 and generate the dic3?

Upvotes: 1

Views: 69

Answers (1)

FreeNickname
FreeNickname

Reputation: 7764

One for:

dict3 = [dict1 mutableCopy]
for (id<NSCopying> key in dict3.allKeys) {
    dict3[key] = dict2[dict3[key]];
}

If you don't need to overwrite values that are not present in the dict2 (for instance, there is dict1[15] == 12345, but dict2[12345] == nil), you can add a nil check:

for (id<NSCopying> key in dict3.allKeys) {
    if (dict2[dict3[key]]) {
        dict3[key] = dict2[dict3[key]];
    }
}

UPDATE: With @Caleb's improvements (and a little optimization):

for (id key in dict1) {
    id dict3Value = dict3[key]; //so we don't have to get this value twice
    if (dict2[dict3Value]) {
        dict3[key] = dict2[dict3Value];
    }
}

Upvotes: 4

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