How is the time complexity of updating an element in an array determined?

The time complexity of updating an element in an array is usually considered O(1), meaning constant time. This is because arrays provide direct access to elements by index, and changing the value at a specific index does not require traversing or shifting other elements.

For example, in Dart (used in Flutter), updating an array element looks like this:

List<int> numbers = [1, 2, 3, 4];
numbers[2] = 10; // update the third element

This operation is performed in constant time, regardless of the size of the array.