Fundamental Types

The types a value in a list can have. Each has a page; the Datatypes index groups them by kind.

Several were renamed from historical Rebol: TEXT! was STRING!, BLOB! was BINARY!, GROUP! was PAREN!, and RUNE! replaces CHAR! and ISSUE!. FENCE! and CHAIN! are new, and TUPLE! is now a general sequence.

INTEGER! - 64 bit integer
DECIMAL! - 64bit floating point number (IEEE standard)
PERCENT! - special form of decimals (used mainly for layout)
PAIR! - two dimensional point or size
TIME! - time of day or duration
DATE! - day, month, year, time of day, and timezone
BITSET! - set of bit flags
MAP! - name-value pairs (hash associative)
HANDLE! - arbitrary internal object or value
OPAQUE! - extension cell which uses its type information slot for data
BLOB! - series of bytes
TEXT! - text string series of characters
FILE! - file name or path
TAG! - markup string (HTML or XML)
URL! - uniform resource locator or identifier
EMAIL! - email address
RUNE! - immutable codepoint or codepoint sequence
VARARGS! - evaluator position for variable numbers of arguments
PARAMETER! - function parameter description
OBJECT! - context of names with values
MODULE! - loadable context of code and data
ERROR! - context with id, arguments, and stack origin
PORT! - external series, an I/O channel
FRAME! - arguments and locals of a function state
LET! - context containing a single variable
BLANK! - evaluation separator, no rendering (shows in lists via commas)
TUPLE! - member selection with inert bias
CHAIN! - refinement and function call dialect
PATH! - member or refinement selection with execution bias
BLOCK! - list of elements that blocks evaluation unless EVAL is used
FENCE! - list of elements that are used in construction via MAKE
GROUP! - list that evaluates expressions as an isolated group
WORD! - evaluates a variable or action

Fundamental Types

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