Get/set a property — prop • S7

prop(x, "name") / prop@name get the value of the a property, erroring if it the property doesn't exist.
prop(x, "name") <- value / prop@name <- value set the value of a property.

Usage

prop(object, name)

prop(object, name, check = TRUE) <- value

object@name

Arguments

object: An object from a S7 class
name: The name of the parameter as a character. Partial matching is not performed.
check: If TRUE, check that value is of the correct type and run validate() on the object before returning.
value: A new value for the property. The object is automatically checked for validity after the replacement is done.

Value

prop() and @ return the value of the property. prop<-() and @<- are called for their side-effects and return the modified object, invisibly.

Examples

horse <- new_class("horse", properties = list(
  name = class_character,
  colour = class_character,
  height = class_numeric
))
lexington <- horse(colour = "bay", height = 15, name = "Lex")
lexington@colour
#> [1] "bay"
prop(lexington, "colour")
#> [1] "bay"

lexington@height <- 14
prop(lexington, "height") <- 15