Count number of objects

Usage

objectCount(x)

Arguments

x: An object (an atomic vector, a list, or instance(s) of a class).

Value

Integer representing the count of objects.

Details

Classes in R can roughly be distinguished as following:

Vector-style classes have the property that length() represents number of elements (e.g., factor, list, etc.).
Record-style (or dataframe or scalar) classes, on the other hand, have complex structures to represent a single thing (e.g., data.frame, R6, lm, etc.).

This function counts objects differently depending on the entered class:

If the argument is a vector or a vector-style class, it will return the output from length() function. Otherwise, it will returns 1.

For example,

length(mtcars) returns 11, but objectCount(mtcars) will return 1, while
length(list(1, 2)) returns 2, and objectCount(list(1, 2)) will return 2 as well.

Examples


# vectors or vector-style classes
objectCount(c(1, 2, 3)) # 3
#> [1] 3
objectCount(list("a", "b")) # 2
#> [1] 2
objectCount(list(iris, mtcars)) # 2
#> [1] 2

# everything else
objectCount(mtcars) # 1
#> [1] 1
objectCount(lm(wt ~ mpg, mtcars)) # 1
#> [1] 1
objectCount(new.env()) # 1
#> [1] 1