builtin-functions-reference.md

Built-in Functions Reference

Complete alphabetical list of all 181+ WFL built-in functions.

Core Module (3 functions)

Function	Signature	Returns	Module
display	display <value>	None	Core
isnothing	isnothing of <value>	Boolean	Core
typeof	typeof of <value>	Text	Core

Core Module Details →

Math Module (5 functions)

Function	Signature	Returns	Description
abs	abs of <number>	Number	Absolute value
ceil	ceil of <number>	Number	Round up
clamp	clamp of <value> between <min> and <max>	Number	Constrain to range
floor	floor of <number>	Number	Round down
round	round of <number>	Number	Round to nearest

Math Module Details →

Text Module (8 functions)

Function	Signature	Returns	Description
contains	contains of <text> and <search>	Boolean	Check substring
ends_with	ends_with of <text> and <suffix>	Boolean	Check suffix
length	length of <text>	Number	Character count
starts_with	starts_with of <text> and <prefix>	Boolean	Check prefix
string_split	split of <text> by <delimiter>	List	Split into list
substring	substring of <text> from <start> length <len>	Text	Extract portion
tolowercase	tolowercase of <text>	Text	Convert to lowercase
touppercase	touppercase of <text>	Text	Convert to uppercase
trim	trim of <text>	Text	Remove whitespace

Text Module Details →

List Module (5 functions)

Function	Signature	Returns	Description
indexof	indexof of <list> and <value>	Number	Find position (-1 if not found)
length	length of <list>	Number	Item count
pop	pop of <list>	Any	Remove from end
push	push with <list> and <value>	None	Add to end

List Module Details →

Filesystem Module (20+ functions)

Function	Signature	Returns	Description
copy_file	copy_file from <src> to <dest>	None	Copy file
count_lines	count_lines at <path>	Number	Count lines in file
file_size	file size at <path>	Number	Get file size in bytes
is_dir	is_dir at <path>	Boolean	Check if directory
is_file	is_file at <path>	Boolean	Check if file
list files in	list files in <path>	List	List directory files
makedirs	makedirs <path>	None	Create directory tree
move_file	move_file from <src> to <dest>	None	Move/rename file
path_basename	path basename of <path>	Text	Get filename
path_dirname	path dirname of <path>	Text	Get directory
path_exists	path exists at <path>	Boolean	Check existence
path_extension	path extension of <path>	Text	Get extension
path_join	path_join of <p1> and <p2>...	Text	Join paths
path_stem	path stem of <path>	Text	Filename without extension
remove_dir	remove_dir at <path>	None	Delete directory
remove_file	remove_file at <path>	None	Delete file

Filesystem Module Details →

Time Module (14 functions)

Function	Signature	Returns	Description
add_days	add_days of <date> and <days>	Date	Add days to date
create_date	create_date of <year> and <month> and <day>	Date	Create date
create_time	create_time of <hour> and <min> and <sec>	Time	Create time
current time in milliseconds	current time in milliseconds	Number	Unix timestamp
datetime_now	datetime_now	DateTime	Current datetime
day	day of <date>	Number	Day component
days_between	days_between of <date1> and <date2>	Number	Days difference
dayofweek	dayofweek of <date>	Number	Day of week
format_date	format_date of <date> and <format>	Text	Format date
hour	hour of <time>	Number	Hour component
minute	minute of <time>	Number	Minute component
month	month of <date>	Number	Month component
now	now	Time	Current time
second	second of <time>	Number	Second component
subtract_days	subtract_days of <date> and <days>	Date	Subtract days
today	today	Date	Current date
year	year of <date>	Number	Year component

Time Module Details →

Random Module (6 functions)

Function	Signature	Returns	Description
random	random	Number	Random 0-1
random_between	random_between of <min> and <max>	Number	Random in range
random_boolean	random_boolean	Boolean	Random true/false
random_from	random_from of <list>	Any	Random from list
random_int	random_int between <min> and <max>	Number	Random integer
random_seed	random_seed of <seed>	None	Set RNG seed

Random Module Details →

Crypto Module

Password hashing (10 functions)

Store user passwords with these — never with fast hashes like sha256 or wflhash256 alone. For sensitive credentials, prefer a multi-hash pre-mix (e.g. WFLHASH then sha256) then hash_password.

Function	Signature	Returns	Description
hash_password	hash_password of <password>	Text	Hash a password (Argon2id default)
verify_password	verify_password of <password> and <hash>	Boolean	Verify against any supported hash
argon2_hash	argon2_hash of <password>	Text	Argon2id hash
argon2_verify	argon2_verify of <password> and <hash>	Boolean	Verify Argon2 hash
bcrypt_hash	bcrypt_hash of <password>	Text	bcrypt hash
bcrypt_verify	bcrypt_verify of <password> and <hash>	Boolean	Verify bcrypt hash
scrypt_hash	scrypt_hash of <password>	Text	scrypt hash
scrypt_verify	scrypt_verify of <password> and <hash>	Boolean	Verify scrypt hash
pbkdf2_hash	pbkdf2_hash of <password>	Text	PBKDF2-HMAC-SHA256 hash
pbkdf2_verify	pbkdf2_verify of <password> and <hash>	Boolean	Verify PBKDF2 hash

Auth & session primitives (3 functions)

Function	Signature	Returns	Description
pbkdf2_hmac_sha256	pbkdf2_hmac_sha256 of <password> and <salt> and <iterations> and <length>	Text	Raw PBKDF2-HMAC-SHA256 key derivation (hex)
constant_time_equals	constant_time_equals of <a> and <b>	Boolean	Timing-safe string comparison
secure_random_bytes	secure_random_bytes of <n>	Text	n CSPRNG bytes as hex (for salts, tokens, session IDs)

Hashing & MAC (7 functions)

Function	Signature	Returns	Description
sha256	sha256 of <text>	Text	Standard SHA-256 (FIPS 180-4)
hmac_sha256	hmac_sha256 of <message> and <key>	Text	Standard HMAC-SHA256 (RFC 2104)
wflhash256	wflhash256 of <text>	Text	Experimental 256-bit WFLHASH
wflhash256_with_salt	wflhash256_with_salt of <text> and <salt>	Text	Experimental salted WFLHASH
wflhash512	wflhash512 of <text>	Text	Experimental 512-bit WFLHASH
wflmac256	wflmac256 of <message> and <key>	Text	Experimental WFL MAC
generate_csrf_token	generate_csrf_token	Text	Random 256-bit token

Crypto Module Details →

Security: For sensitive data (especially passwords), use more than one hash. Passwords: multi-hash pre-mix then hash_password/verify_password. WFLHASH is experimental — please test it. For production integrity, dual-hash: WFLHASH then a known-good algorithm (sha256 of wflhash256 of data). Use sha256 / hmac_sha256 alone when interoperating with external services.

Pattern Module (3 functions)

Function	Signature	Returns	Description
pattern_find	find <pattern> in <text>	Match object	Find first match
pattern_find_all	find all <pattern> in <text>	List	Find all matches
pattern_matches	<text> matches <pattern>	Boolean	Test if matches

Pattern Module Details →

---

Quick Lookup

Need to find a function? Use Ctrl+F to search this page.

By category: See Standard Library Index

Detailed docs: Click module links above.

---

Previous: ← Operator Reference | Next: Error Codes →