algos

examples/algos/

Famous, simple algorithms written in Echo. These programs exercise the locked language surface (docs/syntax.md).

cargo build -p xo
./target/debug/xo run examples/algos/factorial.echo
./target/debug/xo run examples/algos/sort.echo

# Real algorithms + normal test.bench (release host recommended):
just bench-host
just algo-bench

Top-level statements run directly — no $ demo wrapper. Benches use the same functions the demos call (test.bench via / std/test).

File	Algorithms
factorial.echo	Iterative and recursive factorial (result for negatives)
fibonacci.echo	Iterative Fibonacci + nth term
gcd.echo	Euclid GCD, LCM, Stein binary GCD
collatz.echo	Collatz / 3n+1 step count
power.echo	Exponentiation by squaring
primes.echo	Trial division + sieve of Eratosthenes
search.echo	Linear search + binary search
sort.echo	Bubble sort + insertion sort (in place)
list.echo	Sum, max/min, reverse, membership (list.len from std)
fizzbuzz.echo	Classic FizzBuzz (kind codes + print)
hanoi.echo	Tower of Hanoi (recursive move count)
digits.echo	Digit sum, reverse digits, numeric palindrome

Notes

• Prefer list.len (/ std/list) over hand-rolled length loops.
• Lists are literals (and bound list values) with index / for-in; append with ~ xs[] = e (and ~ a.b[] = e).