Ruby Data Processing: Using Map, Reduce, and Select by Jay Godse

Author:Jay Godse [Jay Godse]
Language: eng
Format: epub
Tags: Core Programming, Web Development
Publisher: Apress
Published: 2018-02-18T22:00:00+00:00

First, this is obviously a two-dimensional array. So, it will look something like this for a four-row triangle:

[[1],[1,1],[1,2,1],[1,3,3,1]]

For convenient printing, we’ll just do this for now:

triangle.each{|row| p row.inspect}

Given that we’re building a structure of arrays, it seems like a good fit for using reduce(). The initial value is [].

triangle = (0..5).reduce([]) do |memo, n|

memo.push []

end

triangle.each{|row| p row.inspect}

"[]"

"[]"

"[]"

"[]"

"[]"

"[]"

=> [[], [], [], [], [], []]

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