Turns a normal variable into a reactive variable, that is, one that has
reactive semantics when assigned or read in the usual ways. The variable may
already exist; if so, its value will be used as the initial value of the
reactive variable (or NULL if the variable did not exist).
makeReactiveBinding(symbol, env = parent.frame())None.
Name of variable to make reactive, as a string.
Environment in which to create binding. Expert use only.
reactiveConsole(TRUE)
a <- 10
makeReactiveBinding("a")
b <- reactive(a * -1)
observe(print(b()))
a <- 20
a <- 30
reactiveConsole(FALSE)
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