Ruby - Methods
How would you combine a predicate method
valid_email? with a regular expression to check if an email contains '@' and ends with '.com'?How would you combine a predicate method valid_email? with a regular expression to check if an email contains '@' and ends with '.com'?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Understand regex and string methods
Predicate methods should return strict booleans (true/false). The question specifies using a regular expression.Step 2: Analyze options
B uses string methods (no regex); C uses =~ which returns match position (integer) or nil (not strict boolean); D uses match? with regex, returning true/false directly.Final Answer:
def valid_email?(email)\n email.match?(/@.*\.com$/)\nend -> Option DQuick Check:
match? with regex returns boolean [OK]
Quick Trick: Use regex or string methods to check patterns in predicates [OK]
Common Mistakes:
- Confusing =~ return value
- Using match instead of match?
- Ignoring string method chaining
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