What can lead to low performance of collection operations in your code?

Low performance of collection operations in iOS code can be caused by several factors:

• Using inappropriate collection types for specific tasks (e.g., frequent insertions in the middle of an Array, which is costly in terms of time).
• Frequent copying of collections, especially if the collection is large and not using NSMutableArray or other mutable structures.
• Inefficient traversal and search algorithms (e.g., linear search instead of using hash tables).
• Frequent resizing of collections, leading to memory reallocation.
• Using collections without considering thread safety, which can lead to blocking and delays.

Example: if you often add elements to the beginning of an Array, it is better to use a LinkedList or Deque (if available), or an optimized NSMutableArray.

var array = [Int]()
// Adding to the beginning of the array is an expensive operation
array.insert(1, at: 0) // shifts all elements

// Better to add at the end
array.append(1)