Can you give examples of methods that are idempotent in programming?

Idempotent methods are methods that, when called repeatedly with the same parameters, produce the same result and do not further modify the system's state.

Examples of idempotent methods:

• HTTP methods: GET, PUT, DELETE are considered idempotent. For example, calling PUT to update a resource with the same data will not change the resource again.
• Functions in programming: A function that returns a constant or computes a result without side effects.

Example in Python:

def set_value(dictionary, key, value):
    dictionary[key] = value  # Idempotent, as repeated calls with the same parameters will not change the dictionary

my_dict = {}
set_value(my_dict, 'a', 10)
set_value(my_dict, 'a', 10)  # The state will not change after the second call

Unlike, for example, incrementing a counter, which is not idempotent.