12.1.4 Pure functions

• What is a key advantage of pure functions in terms of testing?

  Easy testability
• The 'add(x, y)' function is an example of a pure function.
• What are pure functions defined as?

  Same output, no side effects
• A pure function always returns the same output for the same input.
• Pure functions have no side effects
• What is a key difference between pure and impure functions in terms of output?

  Pure functions always consistent
• Match the feature with the function type:

  Same output for same input ↔️ Pure Function

  May have side effects ↔️ Impure Function
• What does the example of the pure function 'add(x, y)' return?

  Sum of x and y
• The 'random_number()' function is an example of an impure function.
• Why is the 'random_number()' function considered impure?

  Returns different output each time
• Pure functions do not modify any external state
• Arrange the characteristics of pure functions in a logical order:

  1️⃣ Same output for same input

  2️⃣ No side effects

  3️⃣ Does not modify external state
• The 'random.randint(1, 100)' method generates a random number
• Why is the 'random_number()' function impure?

  Output varies for same input
• What is a pure function?

  Same output, no side effects
• A pure function can modify external variables or states.

  False
• A key characteristic of pure functions is that they always return the same output
• What is the primary difference between pure and impure functions?

  Side effects
• Pure functions always produce the same result for the same input.
• An example of a pure function is one that returns the sum of two numbers
• What is an example of an impure function?

  Random number generation
• Pure functions can modify external variables or states.

  False
• Pure functions are easier to test because they have no side effects.
• What is one advantage of pure functions in concurrent programming?

  Better concurrency
• Pure functions may have side effects.

  False
• Pure functions enhance code clarity by isolating functionality.
• Why is a random number generator considered an impure function?

  Different outputs each time