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4 cards from this section. Quick, good the night before a test.
What is an immutable type?
Think of something that remains the same.
Is the following function a pure function? def add(x, y): return x + y.
Check if the function affects any external states.
What is immutability?
Relate it to the concept of permanence.
True or False: A pure function can affect external state.
Consider the definition of pure functions.
Write a pure function multiply(a, b) that takes two integers and returns their product. In what scenarios can this function be problematic if it were impure?
Consider what happens when external states are modified.
Discuss how you would implement immutability in a Python program. Describe a scenario where maintaining immutable state is necessary.
Reflect on how you can ensure that once data is set, it cannot be altered by any future operations.
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