Ruby - Arrays
You have an array data = [nil, 0, false, '', nil, 5]. You want to remove only nil values but keep 0, false, and empty strings. Which code correctly does this?
You have an array data = [nil, 0, false, '', nil, 5]. You want to remove only nil values but keep 0, false, and empty strings. Which code correctly does this?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand what
compactdoescompactremoves onlynilvalues and keeps all other values including0,false, and empty strings.Step 2: Analyze other options
select { |v| v }removes all falsy values (nil,false,0is truthy in Ruby but empty string is truthy), so it removesfalse.reject!(&:nil?)modifies the original array.delete_if { |v| v.nil? }modifies original array.Step 3: Choose best option for new array without nil
compactis simplest and returns new array without modifying original.Final Answer:
clean_data = data.compact -> Option BQuick Check:
compact removes nil only, keeps false and empty string = C [OK]
Quick Trick: Use compact to remove nil only, keep false and empty strings [OK]
Common Mistakes:
- Using select which removes false values
- Using delete_if which modifies original array
- Using reject! which modifies the original array
Master "Arrays" in Ruby
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