Functional Programming Tools

Documentation for package ‘purrr’ version 0.2.1

DESCRIPTION file.

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A B C D E F G H I K L M N O P Q R S T U W Z misc

-- A --

accumulate	Accumulate recursive folds across a list
accumulate_right	Accumulate recursive folds across a list
along	Helper to create vectors with matching length.
array-coercion	Coerce array to list
array_branch	Coerce array to list
array_tree	Coerce array to list
as_function	Convert an object into a function.
as_function.character	Convert an object into a function.
as_vector	Coerce a list to a vector
at_depth	Map a function over lower levels of a nested list

-- B --

bare-type-predicates	Bare type predicates
by_row	Apply a function to each row of a data frame
by_slice	Apply a function to slices of a data frame

-- C --

compact	Keep or discard elements using a predicate function.
compose	Compose multiple functions
conditional-map	Modify elements conditionally
contains	Does a list contain an object?
cross2	Produce all combinations of list elements
cross3	Produce all combinations of list elements
cross_d	Produce all combinations of list elements
cross_n	Produce all combinations of list elements

-- D --

detect	Find the value or position of the first match.
detect_index	Find the value or position of the first match.
discard	Keep or discard elements using a predicate function.
dmap	Map over the columns of a data frame
dmap_at	Map over the columns of a data frame
dmap_if	Map over the columns of a data frame

-- E --

every

Do every or some elements of a list satisfy a predicate?

-- F --

flatten	Flatten a list of lists into a simple vector.
flatten_chr	Flatten a list of lists into a simple vector.
flatten_dbl	Flatten a list of lists into a simple vector.
flatten_df	Flatten a list of lists into a simple vector.
flatten_int	Flatten a list of lists into a simple vector.
flatten_lgl	Flatten a list of lists into a simple vector.

-- G --

get-attr

Infix attribute accessor

-- H --

head_while

Find head/tail that all satisfies a predicate.

-- I --

invoke	Invoke functions.
invoke_map	Invoke functions.
invoke_map_chr	Invoke functions.
invoke_map_dbl	Invoke functions.
invoke_map_df	Invoke functions.
invoke_map_int	Invoke functions.
invoke_map_lgl	Invoke functions.
invoke_rows	Apply a function to each row of a data frame
is_atomic	Type predicates
is_bare_atomic	Bare type predicates
is_bare_character	Bare type predicates
is_bare_double	Bare type predicates
is_bare_integer	Bare type predicates
is_bare_list	Bare type predicates
is_bare_logical	Bare type predicates
is_bare_numeric	Bare type predicates
is_bare_vector	Bare type predicates
is_character	Type predicates
is_double	Type predicates
is_empty	Is a vector/list empty?
is_formula	Is a formula?
is_function	Type predicates
is_integer	Type predicates
is_list	Type predicates
is_logical	Type predicates
is_null	Type predicates
is_numeric	Type predicates
is_scalar_atomic	Scalar type predicates
is_scalar_character	Scalar type predicates
is_scalar_double	Scalar type predicates
is_scalar_integer	Scalar type predicates
is_scalar_list	Scalar type predicates
is_scalar_logical	Scalar type predicates
is_scalar_numeric	Scalar type predicates
is_scalar_vector	Scalar type predicates
is_vector	Type predicates

-- K --

keep	Keep or discard elements using a predicate function.

-- L --

lift	Lift the domain of a function
lift_dl	Lift the domain of a function
lift_dv	Lift the domain of a function
lift_ld	Lift the domain of a function
lift_lv	Lift the domain of a function
lift_vd	Lift the domain of a function
lift_vl	Lift the domain of a function
list_along	Helper to create vectors with matching length.
lmap	Apply a function to list-elements of a list
lmap_at	Apply a function to list-elements of a list
lmap_if	Apply a function to list-elements of a list

-- M --

map	Apply a function to each element of a list.
map2	Map over multiple inputs simultaneously.
map2_chr	Map over multiple inputs simultaneously.
map2_dbl	Map over multiple inputs simultaneously.
map2_df	Map over multiple inputs simultaneously.
map2_int	Map over multiple inputs simultaneously.
map2_lgl	Map over multiple inputs simultaneously.
map3	Map over multiple inputs simultaneously.
map_at	Modify elements conditionally
map_call	Invoke functions.
map_chr	Apply a function to each element of a list.
map_dbl	Apply a function to each element of a list.
map_df	Apply a function to each element of a list.
map_if	Modify elements conditionally
map_int	Apply a function to each element of a list.
map_lgl	Apply a function to each element of a list.
map_n	Map over multiple inputs simultaneously.
map_rows	Apply a function to each row of a data frame

-- N --

negate	Negate a predicate function.
null-default	Default value for 'NULL'.

-- O --

order_by

Split, order and sort lists by their components.

-- P --

partial	Partial apply a function, filling in some arguments.
pmap	Map over multiple inputs simultaneously.
pmap_chr	Map over multiple inputs simultaneously.
pmap_dbl	Map over multiple inputs simultaneously.
pmap_df	Map over multiple inputs simultaneously.
pmap_int	Map over multiple inputs simultaneously.
pmap_lgl	Map over multiple inputs simultaneously.
possibly	Capture side effects.
prepend	Prepend a vector
pwalk	Map over multiple inputs simultaneously.

-- Q --

quietly

Capture side effects.

-- R --

rbernoulli	Generate random samples from a Bernoulli distribution
rdunif	Generate random samples from a discrete uniform distribution
reduce	Reduce a list to a single value by iteratively applying a binary function.
reduce_right	Reduce a list to a single value by iteratively applying a binary function.
rep_along	Helper to create vectors with matching length.
rerun	Re-run expressions multiple times.

-- S --

safely	Capture side effects.
scalar-type-predicates	Scalar type predicates
set_names	Set names in a vector
simplify	Coerce a list to a vector
simplify_all	Coerce a list to a vector
slice_rows	Slice a data frame into groups of rows
some	Do every or some elements of a list satisfy a predicate?
sort_by	Split, order and sort lists by their components.
splice	Splice objects and lists of objects into a list
split_by	Split, order and sort lists by their components.

-- T --

tail_while	Find head/tail that all satisfies a predicate.
transpose	Transpose a list.
type-predicates	Type predicates

-- U --

unslice	Slice a data frame into groups of rows
update_list	Modify a list

-- W --

walk	Apply a function to each element of a list.
walk2	Map over multiple inputs simultaneously.
walk3	Map over multiple inputs simultaneously.
walk_n	Map over multiple inputs simultaneously.
when	Match/validate a set of conditions for an object and continue with the action associated with the first valid match.

-- Z --

zip2	Transpose a list.
zip3	Transpose a list.
zip_n	Transpose a list.

-- misc --

%@%	Infix attribute accessor
%\|\|%	Default value for 'NULL'.