Today I Learned

Replacing num.times.map with Array.new(num)

Problem

I want to create an array containing objects created with an incrementing integer index parameter. For example, an array of hashes containing strings built off of the incrementing number.

Standard Solution

my_array = num.times.map do |index|
  build_hash(index)
end

BUT...rubocop didn't like this:

... C: Performance/TimesMap: Use Array.new with a block instead of .times.map

Improved Solution

The improved solution allows us to build the same array with less chained methods, thus improving readability:

my_array = Array.new(num) do |index|
  build_hash(index)
end