[Solved] You want to write a Ruby method process_order(order) that returns "Invalid order" immediately if order is nil or empty.... Which is the best way to write this using guard clauses? | Ruby

Ruby - Control Flow

You want to write a Ruby method process_order(order) that returns "Invalid order" immediately if order is nil or empty. Otherwise, it returns "Processing order". Which is the best way to write this using guard clauses?

Areturn "Invalid order" if order.nil? || order.empty? "Processing order"

Bif order.nil? || order.empty? return "Invalid order" else "Processing order" end

Cunless order.nil? && order.empty? return "Invalid order" end "Processing order"

Dreturn "Invalid order" unless order.nil? || order.empty? "Processing order"

Step-by-Step Solution

Solution:

Step 1: Identify correct guard clause condition
The method should return early if order is nil OR empty, so condition is order.nil? || order.empty?.
Step 2: Check each option's logic and syntax
return "Invalid order" if order.nil? || order.empty? "Processing order" uses a guard clause with correct condition and returns "Invalid order" early, then returns "Processing order" otherwise. if order.nil? || order.empty? return "Invalid order" else "Processing order" end uses if-else but not guard clause style. unless order.nil? && order.empty? return "Invalid order" end "Processing order" uses unless with && which is incorrect logic. return "Invalid order" unless order.nil? || order.empty? "Processing order" uses unless with || but negated logic, causing wrong behavior.
Final Answer:
return "Invalid order" if order.nil? || order.empty? "Processing order" -> Option A
Quick Check:
Guard clause with correct condition = return "Invalid order" if order.nil? || order.empty? "Processing order" [OK]

Quick Trick: Use 'return value if condition' with correct OR logic [OK]

Common Mistakes:

Using && instead of || in condition
Negating condition incorrectly with unless
Not returning early with guard clause

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Which is the best way to write this using guard clauses?

Step 1: Identify correct guard clause condition

Step 2: Check each option's logic and syntax

Final Answer:

Quick Check:

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