Create functions. Ditch duplication.

Duplication duplication duplication...

Have you ever seen an R script that looks like this:

print(
  round(mean(subset(
    na.omit(data), species == "Adelie" & island == "Torgersen"
  )$bill_length_mm), 2)
)
print(
  round(mean(subset(
    na.omit(data), species == "Adelie" & island == "Biscoe"
  )$bill_length_mm), 2)
)
print(
  round(mean(subset(
    na.omit(data), species == "Adelie" & island == "Dream"
  )$bill_length_mm), 2)
)

The same thing is done 3 times: once for Torgersen, once for Biscoe and once for Dream.

This code is very hard to work with:

❌ Hard to read: that's a lot of code!

❌ Hard to maintain: if you want to change something, you will have to make the change 3 times.

❌ Error prone: one day, you will update all items and insert a bug in one. Or you will update an item and forget about the others.

It's time to create a function!

Productive R Workflow

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