demo_expr: A tool for experimentation with R's callback mechanism.

In ncarchedi/omnitest: Utilities to improve swirl::omnitest

Description

Enter demo_expr() to begin and bye() to finish. For every valid command entered, the command itself, its class, and an abstract syntax tree will be displayed, preceded by a count of the number of times the callback has been invoked. The count shows that the callback is invoked for every valid expression entered. If multiple expressions separated by semicolons are entered on the same line, the callback will be invoked once for each.

Usage

demo_expr()

ncarchedi/omnitest documentation built on May 23, 2019, 1:05 p.m.