Booleans are a language feature.
In computer science, the Boolean data type is a data type that has one of two possible values (usually denoted true and false), intended to represent the two truth values of logic and Boolean algebra.
Languages without Booleans include Markdown, SQLite, Ini
Languages with Booleans include Java, JavaScript, C, Python, C++, SQL, PHP, Ruby, R, Go, C#, Scala, Swift, MySQL, JSON, Rust, Lua, TypeScript, COBOL, PostgreSQL, Visual Basic, Kotlin, Julia, Pascal, Ada, OCaml, Dart, Groovy, F#, CoffeeScript, Solidity, Crystal, Reason, GraphQL, Modula-2, UML, Modula-3, Simula, PL/SQL, ANTLR, Visual Basic .NET, Oz, Protocol Buffers, HCL, MoonScript, SPARQL, Liquid, F*, ABAP, Lasso, MariaDB, Twig, Nearley, Isabelle, NetLogo, Transact-SQL, wisp, TLA, EDN, Classroom Object Oriented Language, idyll, Click, S-algol, eC, XL, BlitzBasic, ArkScript, Angelscript, Apex, Action!, Augmented Backus-Naur Form, Concise Encoding, spry, Ligo, PowerQuery M, Ezhil, Cell, JSON Lines, Bluespec, Ion, Spin, Jison Lex, Sophia, Amazon Redshift, carth, blockml, Ren, Caché Basic, PLZ, fizz, C/AL, Jupyter Notebook, PROMAL, Freefem, llhd, Arden syntax, Mscgen, opengraph, Friendly Enough Expression Language, mckeeman-form
c := true
false
const result = true
null.bool
true
false
true
false
1
0