Today I Learned

hashrocket A Hashrocket project

Map with Index

Ever wanted map_with_index, like each_with_index except for map instead of each? Turns out you can, with just a 1 character change. with_index is a method on Enumerator that lets you do just that:

['a', 'b', 'c'].map.with_index do |x, index|
  [x, index]
#=> [["a", 0], ["b", 1], ["c", 2]]


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