System

I/O

Module name: "io". Can be disabled for sandboxed scripts.

Function	Signature	Description
readFile	(path: string) -> string	Read file contents
writeFile	(path: string, content: string)	Write to file
readLine	() -> string	Read line from stdin
fileExists	(path: string) -> bool	Check if file exists

let content = readFile("data/config.writ")
writeFile("output/log.txt", "Game started")
let line = readLine()
let exists = fileExists("saves/slot1.dat")

---

Time

Module name: "time".

Function	Signature	Description
now	() -> float	Current timestamp (seconds)
elapsed	(start: float) -> float	Seconds since start

let start = now()
// ... do work ...
let elapsed = elapsed(start)  // seconds since start

---

Random

Module name: "random". Backed by the rand crate.

Function	Signature	Description
random	() -> float	Float in 0.0..1.0
randomInt	(min: int, max: int) -> int	Int in min..=max
randomFloat	(min: float, max: float) -> float	Float in range
shuffle	(arr: Array<T>)	Shuffle array in place

random()                   // float in 0.0..1.0
randomInt(1, 6)            // int in 1..=6 (inclusive)
randomFloat(0.0, 100.0)    // float in range
shuffle(myArray)           // shuffles array in place

---

Regex

Module name: "regex". Backed by the regex crate.

Method	Signature	Description
test	(input: string) -> bool	Does pattern match?
match	(input: string) -> Optional<string>	First match
matchAll	(input: string) -> Array<string>	All matches
replace	(input: string, rep: string) -> string	Replace first occurrence
replaceAll	(input: string, rep: string) -> string	Replace all occurrences

let re = Regex("\\d+")

re.test("abc123")          // true
re.match("abc123")         // Optional<string> — first match
re.matchAll("a1b2c3")      // Array<string> — all matches
re.replace("a1b2", "X")    // "aXb2"
re.replaceAll("a1b2", "X") // "aXbX"