[Solved] You want to set a default value for a hash key only if it is missing or nil. Which code correctly uses ||= for this?settings = { theme: nil } settings[:theme] ||= "dark" puts settings[:theme] | Ruby

Ruby - Operators and Expressions

You want to set a default value for a hash key only if it is missing or nil. Which code correctly uses ||= for this?

settings = { theme: nil }
settings[:theme] ||= "dark"
puts settings[:theme]

ARaises error because hash keys can't use ||=

BOutputs "dark" because theme was nil

COutputs nil because ||= does not work on hash keys

DOutputs nil because theme key exists

Step-by-Step Solution

Solution:

Step 1: Check initial value of settings[:theme]
It is nil, so falsy.
Step 2: Apply ||= operator on hash key
Since nil, settings[:theme] ||= "dark" assigns "dark".
Final Answer:
Outputs "dark" because theme was nil -> Option B
Quick Check:
||= works on hash values, assigns if nil [OK]

Quick Trick: ||= works on hash values to set defaults [OK]

Common Mistakes:

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You want to set a default value for a hash key only if it is missing or nil. Which code correctly uses ||= for this?