Objective C: for in iterating but excluding object in array

Question

How can I iterate through an array for two objects to compare them, but at the second iteration (for obj2) I want to exclude comparing the object (obj1) that already was found to match? In other words, I don´t want them to both find the same object.

for (object *obj1 in array) 
    if (obj1 == "this") //run next iteration
    for (object *obj2 in array)
    // if (obj2 == @"this");

If you are trying to keep the elements of your array unique, look at NSMutableSet and NSMutableOrderedSet (if a strong order is also needed.) — Jonathan Grynspan
– Jonathan Grynspan, Commented Feb 8, 2013 at 6:41

Nikita P · Accepted Answer · 2013-02-08 05:44:09Z

1

for(object *obj1 in array) {
    for (object *obj2 in array) {
        if(obj1 == obj2) continue; //this matches if the object is same
        //do your code
    }
}

answered Feb 8, 2013 at 5:44

Nikita P

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1 Comment

indragie Over a year ago

It's worth noting that == is a pointer comparison, which will only be true for the exact same object. If you want to also match different instances of an object with the same value, use -isEqual: instead.

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