Built-in functions

Always available, no import required.

I/O

Function	Description
`print(...values)`	Print values separated by spaces, then a newline.
`write(...values)`	Like `print` but with no trailing newline.
`input([prompt])`	Print the optional prompt, read one line from stdin (returns `nil` at EOF).

Conversion & inspection

Function	Description
`len(x)`	Length of a string, list, or dict.
`type(x)`	Type name (`"number"`, `"string"`, …; a class name for instances).
`str(x)`	Display-string form of a value.
`repr(x)`	Debug form (strings come back quoted).
`num(x)`	Parse a number from a string / bool / number.
`int(x)`	Truncate a number (or parsed string) toward zero.
`bool(x)`	Truthiness of a value.

Math

Function	Description
`abs(n)`	Absolute value.
`floor(n)` / `ceil(n)` / `round(n)`	Round down / up / nearest.
`sqrt(n)`	Square root.
`pow(base, exp)`	Exponentiation.
`min(a, b, ...)` / `min(list)`	Smallest number.
`max(a, b, ...)` / `max(list)`	Largest number.
`range(stop)` / `range(start, stop[, step])`	Build a list of numbers.

Collections

Function	Description
`push(list, x)`	Append `x`; returns the list.
`pop(list)`	Remove and return the last element.
`keys(dict)`	List of keys.
`values(dict)`	List of values.

Misc

Function	Description
`ord(s)`	Character code of the first character.
`chr(n)`	One-character string for code point `n`.
`assert(cond[, message])`	Raise a runtime error if `cond` is falsey.

print(range(5))            # [0, 1, 2, 3, 4]
print(range(1, 4))         # [1, 2, 3]
print(range(0, 10, 2))     # [0, 2, 4, 6, 8]
print(max([3, 1, 4, 1]))   # 4
print(chr(65), ord("A"))   # A 65
assert(1 + 1 == 2, "math broke")