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description=Create, test, and visualize DFAs and NFAs, with more to come!;

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delta theory of computation tools automata guide v 0 3 0 beta 1 toggle sidebar menu v 0 3 0 beta 1 nfa dfa pda turing machine quick start api reference watch the demo on youtube design automata as software delta is a code first environment for building and testing finite automata and turing machines in typescript launch delta github view on github code debug import dfa q from delta lib const machine dfa of a s divisible by 2 or 3 alphabet a b states q 0 5 start q0 accept q0 q2 q3 q4 increment a all s s loop b build export default machine features modeled after an ide fluent typescript api define machines with a chainable builder errors surface at compile time right in the editor step through visualizer watch your machine process input state by state the active transition highlights at every step inline test suites pair any machine with a test suite delta runs them all and reports pass fail right next to your code nfa to dfa conversion convert any nfa via subset construction and see how they relate with semantic state names shareable urls every machine can be turned into a url share machines with a link no hoops required thompson s construction build nfas from regular expressions with a stack based api mirroring union concat and kleene star machine types chomsky s hierarchy regular nfa dfa nondeterministic and deterministic finite automata build with the typescript api or a visual canvas editor open nfa dfa context free pda pushdown automata with full stack visualization model context free languages and watch each push and pop in real time open pda recursively enumerable turing machine single and multitape turing machines the transition table highlights the active rule at every step open turing machine correctness test your machines compilation errors catch invalid transitions before you run anything test suites make correctness verifiable not just visually convincing export test suites to share with instructors or collaborators test suite 5 of 6 a reject aa accept aaa accept aaaa reject aaaaaa accept aaaaaaa reject ready to dive in write your first automaton in minutes launch delta delta nfa dfa pda turing machines guide github 2026 sydney newmark