STDLIB Reference Manual

STDLIB

Reference Manual

Version 4.2

User's Guide
Reference Manual
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STDLIB (App)
array
- Top of manual page
- default/1
- fix/1
- foldl/3
- foldr/3
- from_list/1
- from_list/2
- from_orddict/1
- from_orddict/2
- get/2
- is_array/1
- is_fix/1
- map/2
- new/0
- new/1
- new/2
- relax/1
- reset/2
- resize/1
- resize/2
- set/3
- size/1
- sparse_foldl/3
- sparse_foldr/3
- sparse_map/2
- sparse_size/1
- sparse_to_list/1
- sparse_to_orddict/1
- to_list/1
- to_orddict/1
assert.hrl
base64
beam_lib
binary
c
- Top of manual page
- bt/1
- c/1
- c/2
- c/3
- cd/1
- erlangrc/1
- flush/0
- h/1
- h/2
- h/3
- hcb/1
- hcb/2
- hcb/3
- help/0
- ht/1
- ht/2
- ht/3
- i/0
- i/3
- l/1
- lc/1
- lm/0
- ls/0
- ls/1
- m/0
- m/1
- memory/0
- memory/1
- mm/0
- nc/1
- nc/2
- ni/0
- nl/1
- nregs/0
- pid/3
- pwd/0
- q/0
- regs/0
- uptime/0
- xm/1
- y/1
- y/2
calendar
dets
- Top of manual page
- all/0
- bchunk/2
- close/1
- delete/2
- delete_all_objects/1
- delete_object/2
- first/1
- foldl/3
- foldr/3
- from_ets/2
- info/1
- info/2
- init_table/2
- init_table/3
- insert/2
- insert_new/2
- is_compatible_bchunk_format/2
- is_dets_file/1
- lookup/2
- match/1
- match/2
- match/3
- match_delete/2
- match_object/1
- match_object/2
- match_object/3
- member/2
- next/2
- open_file/1
- open_file/2
- pid2name/1
- repair_continuation/2
- safe_fixtable/2
- select/1
- select/2
- select/3
- select_delete/2
- slot/2
- sync/1
- table/1
- table/2
- to_ets/2
- traverse/2
- update_counter/3
dict
- Top of manual page
- append/3
- append_list/3
- erase/2
- fetch/2
- fetch_keys/1
- filter/2
- find/2
- fold/3
- from_list/1
- is_empty/1
- is_key/2
- map/2
- merge/3
- new/0
- size/1
- store/3
- take/2
- to_list/1
- update/3
- update/4
- update_counter/3
digraph
- Top of manual page
- add_edge/3
- add_edge/4
- add_edge/5
- add_vertex/1
- add_vertex/2
- add_vertex/3
- del_edge/2
- del_edges/2
- del_path/3
- del_vertex/2
- del_vertices/2
- delete/1
- edge/2
- edges/1
- edges/2
- get_cycle/2
- get_path/3
- get_short_cycle/2
- get_short_path/3
- in_degree/2
- in_edges/2
- in_neighbours/2
- info/1
- new/0
- new/1
- no_edges/1
- no_vertices/1
- out_degree/2
- out_edges/2
- out_neighbours/2
- vertex/2
- vertices/1
digraph_utils
epp
erl_anno
- Top of manual page
- column/1
- end_location/1
- file/1
- from_term/1
- generated/1
- is_anno/1
- line/1
- location/1
- new/1
- set_file/2
- set_generated/2
- set_line/2
- set_location/2
- set_record/2
- set_text/2
- text/1
- to_term/1
erl_error
erl_eval
- Top of manual page
- add_binding/3
- binding/2
- bindings/1
- del_binding/2
- expr/2
- expr/3
- expr/4
- expr/5
- expr_list/2
- expr_list/3
- expr_list/4
- exprs/2
- exprs/3
- exprs/4
- new_bindings/0
erl_expand_records
- Top of manual page
- module/2
erl_features
erl_id_trans
erl_internal
erl_lint
erl_parse
erl_pp
- Top of manual page
- attribute/1
- attribute/2
- expr/1
- expr/2
- expr/3
- expr/4
- exprs/1
- exprs/2
- exprs/3
- form/1
- form/2
- function/1
- function/2
- guard/1
- guard/2
- legalize_vars/1
erl_scan
- Top of manual page
- category/1
- column/1
- end_location/1
- format_error/1
- line/1
- location/1
- reserved_word/1
- string/1
- string/2
- string/3
- symbol/1
- text/1
- tokens/3
- tokens/4
erl_tar
- Top of manual page
- add/3
- add/4
- close/1
- create/2
- create/3
- extract/1
- extract/2
- format_error/1
- init/3
- open/2
- t/1
- table/1
- table/2
- tt/1
ets
- Top of manual page
- all/0
- delete/1
- delete/2
- delete_all_objects/1
- delete_object/2
- file2tab/1
- file2tab/2
- first/1
- foldl/3
- foldr/3
- from_dets/2
- fun2ms/1
- give_away/3
- i/0
- i/1
- info/1
- info/2
- init_table/2
- insert/2
- insert_new/2
- is_compiled_ms/1
- last/1
- lookup/2
- lookup_element/3
- match/1
- match/2
- match/3
- match_delete/2
- match_object/1
- match_object/2
- match_object/3
- match_spec_compile/1
- match_spec_run/2
- member/2
- new/2
- next/2
- prev/2
- rename/2
- repair_continuation/2
- safe_fixtable/2
- select/1
- select/2
- select/3
- select_count/2
- select_delete/2
- select_replace/2
- select_reverse/1
- select_reverse/2
- select_reverse/3
- setopts/2
- slot/2
- tab2file/2
- tab2file/3
- tab2list/1
- tabfile_info/1
- table/1
- table/2
- take/2
- test_ms/2
- to_dets/2
- update_counter/3
- update_counter/4
- update_element/3
- whereis/1
file_sorter
- Top of manual page
- check/1
- check/2
- keycheck/2
- keycheck/3
- keymerge/3
- keymerge/4
- keysort/2
- keysort/3
- keysort/4
- merge/2
- merge/3
- sort/1
- sort/2
- sort/3
filelib
filename
- Top of manual page
- absname/1
- absname/2
- absname_join/2
- basedir/2
- basedir/3
- basename/1
- basename/2
- dirname/1
- extension/1
- flatten/1
- join/1
- join/2
- nativename/1
- pathtype/1
- rootname/1
- rootname/2
- split/1
gb_sets
- Top of manual page
- add/2
- add_element/2
- balance/1
- del_element/2
- delete/2
- delete_any/2
- difference/2
- empty/0
- filter/2
- fold/3
- from_list/1
- from_ordset/1
- insert/2
- intersection/1
- intersection/2
- is_disjoint/2
- is_element/2
- is_empty/1
- is_member/2
- is_set/1
- is_subset/2
- iterator/1
- iterator_from/2
- largest/1
- new/0
- next/1
- singleton/1
- size/1
- smallest/1
- subtract/2
- take_largest/1
- take_smallest/1
- to_list/1
- union/1
- union/2
gb_trees
- Top of manual page
- balance/1
- delete/2
- delete_any/2
- empty/0
- enter/3
- from_orddict/1
- get/2
- insert/3
- is_defined/2
- is_empty/1
- iterator/1
- iterator_from/2
- keys/1
- largest/1
- lookup/2
- map/2
- next/1
- size/1
- smallest/1
- take/2
- take_any/2
- take_largest/1
- take_smallest/1
- to_list/1
- update/3
- values/1
gen_event
gen_fsm
gen_server
gen_statem
io
- Top of manual page
- columns/0
- columns/1
- format/1
- format/2
- format/3
- fread/2
- fread/3
- fwrite/1
- fwrite/2
- fwrite/3
- get_chars/2
- get_chars/3
- get_line/1
- get_line/2
- getopts/0
- getopts/1
- nl/0
- nl/1
- parse_erl_exprs/1
- parse_erl_exprs/2
- parse_erl_exprs/3
- parse_erl_exprs/4
- parse_erl_form/1
- parse_erl_form/2
- parse_erl_form/3
- parse_erl_form/4
- printable_range/0
- put_chars/1
- put_chars/2
- read/1
- read/2
- read/3
- read/4
- rows/0
- rows/1
- scan_erl_exprs/1
- scan_erl_exprs/2
- scan_erl_exprs/3
- scan_erl_exprs/4
- scan_erl_form/1
- scan_erl_form/2
- scan_erl_form/3
- scan_erl_form/4
- setopts/1
- setopts/2
- write/1
- write/2
io_lib
lists
- Top of manual page
- all/2
- any/2
- append/1
- append/2
- concat/1
- delete/2
- droplast/1
- dropwhile/2
- duplicate/2
- enumerate/1
- enumerate/2
- filter/2
- filtermap/2
- flatlength/1
- flatmap/2
- flatten/1
- flatten/2
- foldl/3
- foldr/3
- foreach/2
- join/2
- keydelete/3
- keyfind/3
- keymap/3
- keymember/3
- keymerge/3
- keyreplace/4
- keysearch/3
- keysort/2
- keystore/4
- keytake/3
- last/1
- map/2
- mapfoldl/3
- mapfoldr/3
- max/1
- member/2
- merge/1
- merge/2
- merge/3
- merge3/3
- min/1
- nth/2
- nthtail/2
- partition/2
- prefix/2
- reverse/1
- reverse/2
- search/2
- seq/2
- seq/3
- sort/1
- sort/2
- split/2
- splitwith/2
- sublist/2
- sublist/3
- subtract/2
- suffix/2
- sum/1
- takewhile/2
- ukeymerge/3
- ukeysort/2
- umerge/1
- umerge/2
- umerge/3
- umerge3/3
- uniq/1
- uniq/2
- unzip/1
- unzip3/1
- usort/1
- usort/2
- zip/2
- zip3/3
- zipwith/3
- zipwith3/4
log_mf_h
maps
- Top of manual page
- filter/2
- filtermap/2
- find/2
- fold/3
- foreach/2
- from_keys/2
- from_list/1
- get/2
- get/3
- groups_from_list/2
- groups_from_list/3
- intersect/2
- intersect_with/3
- is_key/2
- iterator/1
- keys/1
- map/2
- merge/2
- merge_with/3
- new/0
- next/1
- put/3
- remove/2
- size/1
- take/2
- to_list/1
- update/3
- update_with/3
- update_with/4
- values/1
- with/2
- without/2
math
- Top of manual page
- acos/1
- acosh/1
- asin/1
- asinh/1
- atan/1
- atan2/2
- atanh/1
- ceil/1
- cos/1
- cosh/1
- erf/1
- erfc/1
- exp/1
- floor/1
- fmod/2
- log/1
- log10/1
- log2/1
- pi/0
- pow/2
- sin/1
- sinh/1
- sqrt/1
- tan/1
- tanh/1
ms_transform
orddict
- Top of manual page
- append/3
- append_list/3
- erase/2
- fetch/2
- fetch_keys/1
- filter/2
- find/2
- fold/3
- from_list/1
- is_empty/1
- is_key/2
- map/2
- merge/3
- new/0
- size/1
- store/3
- take/2
- to_list/1
- update/3
- update/4
- update_counter/3
ordsets
- Top of manual page
- add_element/2
- del_element/2
- filter/2
- fold/3
- from_list/1
- intersection/1
- intersection/2
- is_disjoint/2
- is_element/2
- is_empty/1
- is_set/1
- is_subset/2
- new/0
- size/1
- subtract/2
- to_list/1
- union/1
- union/2
peer
- Top of manual page
- call/4
- call/5
- cast/4
- get_state/1
- random_name/0
- random_name/1
- send/3
- start/1
- start_link/0
- start_link/1
- stop/1
pool
- Top of manual page
- attach/1
- get_node/0
- get_nodes/0
- pspawn/3
- pspawn_link/3
- start/1
- start/2
- stop/0
proc_lib
- Top of manual page
- format/1
- format/2
- format/3
- hibernate/3
- init_ack/1
- init_ack/2
- initial_call/1
- spawn/1
- spawn/2
- spawn/3
- spawn/4
- spawn_link/1
- spawn_link/2
- spawn_link/3
- spawn_link/4
- spawn_opt/2
- spawn_opt/3
- spawn_opt/4
- spawn_opt/5
- start/3
- start/4
- start/5
- start_link/3
- start_link/4
- start_link/5
- start_monitor/3
- start_monitor/4
- start_monitor/5
- stop/1
- stop/3
- translate_initial_call/1
proplists
qlc
- Top of manual page
- append/1
- append/2
- cursor/1
- cursor/2
- delete_cursor/1
- e/1
- e/2
- eval/1
- eval/2
- fold/3
- fold/4
- format_error/1
- info/1
- info/2
- keysort/2
- keysort/3
- next_answers/1
- next_answers/2
- q/1
- q/2
- sort/1
- sort/2
- string_to_handle/1
- string_to_handle/2
- string_to_handle/3
- table/2
queue
- Top of manual page
- all/2
- any/2
- cons/2
- daeh/1
- delete/2
- delete_r/2
- delete_with/2
- delete_with_r/2
- drop/1
- drop_r/1
- filter/2
- filtermap/2
- fold/3
- from_list/1
- get/1
- get_r/1
- head/1
- in/2
- in_r/2
- init/1
- is_empty/1
- is_queue/1
- join/2
- lait/1
- last/1
- len/1
- liat/1
- member/2
- new/0
- out/1
- out_r/1
- peek/1
- peek_r/1
- reverse/1
- snoc/2
- split/2
- tail/1
- to_list/1
rand
- Top of manual page
- bytes/1
- bytes_s/2
- export_seed/0
- export_seed_s/1
- exsp_jump/1
- exsp_next/1
- jump/0
- jump/1
- mwc59/1
- mwc59_float/1
- mwc59_seed/0
- mwc59_seed/1
- mwc59_value/1
- mwc59_value32/1
- normal/0
- normal/2
- normal_s/1
- normal_s/3
- seed/1
- seed/2
- seed_s/1
- seed_s/2
- splitmix64_next/1
- uniform/0
- uniform/1
- uniform_real/0
- uniform_real_s/1
- uniform_s/1
- uniform_s/2
random
- Top of manual page
- seed/0
- seed/1
- seed/3
- seed0/0
- uniform/0
- uniform/1
- uniform_s/1
- uniform_s/2
re
- Top of manual page
- compile/1
- compile/2
- inspect/2
- replace/3
- replace/4
- run/2
- run/3
- split/2
- split/3
- version/0
sets
- Top of manual page
- add_element/2
- del_element/2
- filter/2
- fold/3
- from_list/1
- from_list/2
- intersection/1
- intersection/2
- is_disjoint/2
- is_element/2
- is_empty/1
- is_set/1
- is_subset/2
- new/0
- new/1
- size/1
- subtract/2
- to_list/1
- union/1
- union/2
shell
shell_default
shell_docs
slave
- Top of manual page
- pseudo/1
- pseudo/2
- relay/1
- start/1
- start/2
- start/3
- start_link/1
- start_link/2
- start_link/3
- stop/1
sofs
string
- Top of manual page
- casefold/1
- centre/2
- centre/3
- chars/2
- chars/3
- chomp/1
- chr/2
- concat/2
- copies/2
- cspan/2
- equal/2
- equal/3
- equal/4
- find/2
- find/3
- is_empty/1
- join/2
- left/2
- left/3
- len/1
- length/1
- lexemes/2
- lowercase/1
- next_codepoint/1
- next_grapheme/1
- nth_lexeme/3
- pad/2
- pad/3
- pad/4
- prefix/2
- rchr/2
- replace/3
- replace/4
- reverse/1
- right/2
- right/3
- rstr/2
- slice/2
- slice/3
- span/2
- split/2
- split/3
- str/2
- strip/1
- strip/2
- strip/3
- sub_string/2
- sub_string/3
- sub_word/2
- sub_word/3
- substr/2
- substr/3
- take/2
- take/3
- take/4
- titlecase/1
- to_float/1
- to_graphemes/1
- to_integer/1
- to_lower/1
- to_upper/1
- tokens/2
- trim/1
- trim/2
- trim/3
- uppercase/1
- words/1
- words/2
supervisor
supervisor_bridge
sys
timer
- Top of manual page
- apply_after/4
- apply_interval/4
- cancel/1
- exit_after/2
- exit_after/3
- hms/3
- hours/1
- kill_after/1
- kill_after/2
- minutes/1
- now_diff/2
- seconds/1
- send_after/2
- send_after/3
- send_interval/2
- send_interval/3
- sleep/1
- start/0
- tc/1
- tc/2
- tc/3
unicode
uri_string
win32reg
zip
- Top of manual page
- create/2
- create/3
- extract/1
- extract/2
- foldl/3
- list_dir/1
- list_dir/2
- t/1
- table/1
- table/2
- tt/1
- unzip/1
- unzip/2
- zip/2
- zip/3
- zip_close/1
- zip_get/1
- zip_get/2
- zip_list_dir/1
- zip_open/1
- zip_open/2

STDLIB Reference Manual

STDLIB Reference Manual

Version 4.2

May 3, 2026