What is the purpose of using pure functions in programming?.

Pure functions are functions that always return the same result given the same inputs and have no side effects (do not modify external state).

Purpose of using pure functions:

• Predictability: the result depends only on input parameters, which makes testing and debugging easier.
• No side effects: the function does not change external variables or state, reducing the likelihood of errors.
• Simplification of parallelism: pure functions can be safely executed concurrently in different threads.
• Improved readability and maintainability of code: the code becomes more modular and understandable.

Example of a pure function in Python:

def add(a, b):
    return a + b

This function always returns the sum of a and b and does not change anything outside itself.