[Solved] Why should pure functions avoid modifying variables outside their scope in Ruby? — Ans: To ensure the function's output depends only on its input. | Ruby

Ruby - Functional Patterns in Ruby

Why should pure functions avoid modifying variables outside their scope in Ruby?

ATo ensure the function's output depends only on its input.

BTo make the function run faster.

CTo allow the function to print results.

DTo use global variables effectively.

Step-by-Step Solution

Solution:

Step 1: Recall pure function principle
Pure functions must not depend on or change outside variables to guarantee consistent output.
Step 2: Match options to principle
To ensure the function's output depends only on its input. matches this principle. Options B, C, and D do not relate to purity.
Final Answer:
To ensure the function's output depends only on its input. -> Option A
Quick Check:
Pure functions isolate side effects = To ensure the function's output depends only on its input. [OK]

Quick Trick: No outside changes means output depends only on inputs [OK]

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