Ruby - Functional Patterns in Ruby
Which Ruby code snippet correctly defines a pure function that returns the cube of a number without altering any external variables?
Which Ruby code snippet correctly defines a pure function that returns the cube of a number without altering any external variables?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Identify pure function characteristics
A pure function returns a value based only on its inputs and does not modify external state.Step 2: Analyze each option
def cube(x); x * x * x; end returns the cube of x without side effects. Options B and C modify instance variables, and D outputs to console.Final Answer:
def cube(x); x * x * x; end -> Option CQuick Check:
Pure functions avoid side effects and external state changes. [OK]
Quick Trick: Pure functions do not modify external state. [OK]
Common Mistakes:
- Using instance variables inside the function.
- Printing output instead of returning a value.
- Modifying external variables within the function.
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