Intro to Data Analysis with Ruby -- (SLIDES - http://ladieslearningcode.github.io/llc-intro-to-ruby/slides.html), (LEARNER FILES - http://bit.ly/llc-ruby-data) - No sample project.
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Simplify looping over CSV data; Explain Arrays #14
Previously, looping over CSV was done using this pattern:
CSV.foreach("file.csv") do |row| ...
While a built-in syntax for elem in range is introduced earlier,
this introduces a new looping syntax, which has proven to be
a burden and a distraction for learners.
These changes avoid this burden by sticking to the built-in for loop
throughout the slides.
Moreover, a couple slides explaining arrays are added.
Since spreadsheets are a well-known analogy to the CSV data model,
we read the entire CSV data into a 2-dimensional array (array of arrays)
where values can be addressed like cells in a spreadsheet -
by "row" and "column" index.
A slide is also added that presents the CSV data in a table
to reinforce the spreadsheet analogy.
Although it is generally more efficient to process
data on the fly, if possible, I believe the approach taken here
is at the same time easier to understand and provides more insight
into the nature of arrays.
Previously, looping over CSV was done using this pattern:
While a built-in syntax
for elem in rangeis introduced earlier, this introduces a new looping syntax, which has proven to be a burden and a distraction for learners. These changes avoid this burden by sticking to the built-in for loop throughout the slides.Moreover, a couple slides explaining arrays are added. Since spreadsheets are a well-known analogy to the CSV data model, we read the entire CSV data into a 2-dimensional array (array of arrays) where values can be addressed like cells in a spreadsheet - by "row" and "column" index. A slide is also added that presents the CSV data in a table to reinforce the spreadsheet analogy.
Although it is generally more efficient to process data on the fly, if possible, I believe the approach taken here is at the same time easier to understand and provides more insight into the nature of arrays.
Exercises 4 and 5 are adjusted accordingly.