NSTimeInterval delayLength = 1.0;
NSMutableArray *myArray = [NSMutableArray array];

for (int i = 0; i < 3; i++) {
    [myArray addObject:@(i)];
}

// One second (delayLength) later, myArray will hold a single element, the number 3.
// The `addObject:` message was only sent to myArray a single time

// Make three mutable arrays
NSArray *arrayInstances = @[[NSMutableArray new], [NSMutableArray new], [NSMutableArray new]];

NSTimeInterval delay = 1.0;
for (int i = 0; i < 3; i++) {
  // Debounce any message sent from this specific call site, regardless
  // of the receiver or message name
  [MFHDebouncedCallSite(arrayInstances[i], delay) addObject:@(i)];
}

// .... one second later, 
// Only the last object that was messaged will have received 'addObject:'
[arrayInstances[0] count] == 0;  //true
[arrayInstances[1] count] == 0;  //true
[arrayInstances[2] count] == 1;  //true
[arrayInstances[2] objectAtIndex:0] == @3;  //true