The language
Factor handbook

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Fundamentals
Conventions
Syntax

The stack
Stack machine model
Stack effect declarations
Stack effect checking

Basic data types
Booleans
Numbers
Collections

Evaluation
Words
Shuffle words
Combinators
Co-operative threads

Named values
Lexical variables
Dynamic variables
Global variables

Abstractions
Fried quotations
Objects
Exception handling
Deterministic resource disposal
Memoization
Parsing words
Macros
Continuations

Program organization
Vocabulary loader

Vocabularies tagged extensions implement various additional language abstractions.