deflist {deflist}

Create a deferred list

Description

A read-only list that retrieves elements with a function call. The deferred list is useful for handling large datasets where elements are computed on-demand.

Usage

deflist(
  fun,
  len = 1,
  names,
  memoise = FALSE,
  cache = c("memory", "file"),
  cachedir = NULL
)

Arguments

fun

A function that is used to retrieve elements.

len

Integer, the length of the list (default is 1).

names

Character vector, an optional set of names, one per element.

memoise

Logical, whether to memoise the function to speed up repeated element access (default is FALSE).

cache

Character, use an in-memory or filesystem cache if memoise is TRUE (default is "memory").

cachedir

Character, the file path to the cache (default is NULL).

Details

The deferred list is created using the provided function, length, names, and caching options. The list is read-only, and elements are retrieved using the provided function.

Value

An object of class "deflist" representing the deferred list.

Examples

# Create a deferred list of squares
square_fun <- function(i) i^2
square_deflist <- deflist(square_fun, len = 5)
print(square_deflist)
cat("First element of the list:", square_deflist[[1]], "\n")