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​​Ruby Array Methods

​​A cheatsheet from @molly_struve regarding about working with arrays in Ruby. I thought it was awesome so decided to make this handy little paper document.

​​

​​Here is the link to the original article: https://dev.to/molly_struve/level-up-your-ruby-skillz-working-with-arrays-hnn

​​Each

​​[1, 2, 3].each do |number|

​​  puts "hi #{number}"

​​end

​​


​​log:

​​hi 1

​​hi 2

​​hi 3

​​Map

​​result = [1, 2, 3, 4].map do |number|

​​  number + 2

​​end

​​


​​result = [3, 4, 5, 6]

​​Flat Map

​​result = [1,2,3].flat_map do |number|

​​  ['a', 'b', 'c'].map do |letter|

​​    "#{number}:#{letter}"

​​  end

​​end

​​


​​result = ["1:a", "1:b", "1:c", "2:a", "2:b", "2:c", "3:a", "3:b", "3:c"]

​​Select

​​result = [1, 2, 3, 4].select do |number|

​​  number.even?

​​end

​​


​​result = [2,4]

​​Detect

​​result = [1, 2, 3, 4].detect do |number|

​​  number.even?

​​end

​​


​​result = 2

​​Reject

​​result = [1, 2, 3, 4].reject do |number|

​​  number.even?

​​end

​​


​​result = [1,3]

​​Partition

​​result = [1, 2, 3, 4].partition do |number|

​​  number.even?

​​end

​​