Ruby - Methods
You want to define a method that calculates the total price with tax. The tax rate should default to 0.1 (10%) if not provided. Which method definition correctly achieves this?
You want to define a method that calculates the total price with tax. The tax rate should default to 0.1 (10%) if not provided. Which method definition correctly achieves this?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Check default parameter syntax and value
def total_price(price, tax_rate = 0.1) price + price * tax_rate end correctly sets tax_rate default to 0.1 using parameter = value syntax.Step 2: Evaluate other options
def total_price(price, tax_rate) tax_rate ||= 0.1 price + price * tax_rate end uses fallback inside method body, which works but is not default parameter. def total_price(price, tax_rate = ) price + price * tax_rate end has invalid empty default. def total_price(price, tax_rate = 10) price + price * tax_rate end sets tax_rate to 10 (1000%), which is incorrect.Final Answer:
def total_price(price, tax_rate = 0.1) ... -> Option AQuick Check:
Use parameter = default_value for defaults [OK]
Quick Trick: Set default tax as parameter = 0.1 for clarity [OK]
Common Mistakes:
- Leaving default value empty
- Using incorrect default values
- Using fallback inside method instead of default parameter
Master "Methods" in Ruby
Want More Practice?
15+ quiz questions · All difficulty levels · Free
Free Signup - Practice All QuestionsMore Ruby Quizzes