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2 changes: 1 addition & 1 deletion S3.Rmd
Original file line number Diff line number Diff line change
Expand Up @@ -233,7 +233,7 @@ The constructor should follow three principles:

* Check the type of the base object and the types of each attribute.

I'll illustrate these ideas by creating constructors for base classes[^base-constructors] that you're already familiar with. To start, lets make a constructor for the simplest S3 class: `Date`. A `Date` is just a double with a single attribute: its `class` is "Date". This makes for a very simple constructor:
I'll illustrate these ideas by creating constructors for base classes[^base-constructors] that you're already familiar with. To start, let's make a constructor for the simplest S3 class: `Date`. A `Date` is just a double with a single attribute: its `class` is "Date". This makes for a very simple constructor:

[^base-constructors]: Recent versions of R have `.Date()`, `.difftime()`, `.POSIXct()`, and `.POSIXlt()` constructors but they are internal, not well documented, and do not follow the principles that I recommend.

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