Types

Clarity Type System

The type system contains the following types:

Types	Notes
int	signed 128-bit integer
uint	unsigned 128-bit integer
bool	boolean value (true or false)
principal	object representing a principal (whether a contract principal or standard principal)
(buff max-len)	byte buffer of maximum length max-len.
(string-ascii max-len)	ASCII string of maximum length max-len
(string-utf8 max-len)	UTF-8 string of maximum length max-len (u"A smiley face emoji \u{1F600} as a utf8 string")
(list max-len entry-type)	list of maximum length max-len, with entries of type entry-type
{label-0: value-type-0, label-1: value-type-1, ...}	tuple, group of data values with named fields
(optional some-type)	an option type for objects that can either be (some value) or none
(response ok-type err-type)	object used by public functions to commit their changes or abort. May be returned or used by other functions as well, however, only public functions have the commit/abort behavior.