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A reactive expression is an R expression that uses widget input and returns a value. The reactive expression will update this value whenever the original widget changes. To create a reactive expression use the reactive function, which takes an R expression surrounded by braces (just like the render* functions). R Environment and Scope In this article, you’ll learn about the environment (global environment, cascading of environments and so on) in R programming. You will also learn about scope of variables with the help of examples. Assign the value of the expression that converts Tanya's height ( 172 cm) from centimeters to inches to a variable named height_inches (where 1cm = 0.39 inches ). expression. The expression to be printed. return. If you would like to capture the output of print_r(), use the return parameter. When this parameter is set to TRUE, print_r() will return the information rather than print it.