Some sample bf-programs collected from the Internet
some contrived (small) programs
// clears the 0-cell
run("[-]", Map(0->100)) // Map will be 0 -> 0// moves content of the 0-cell to 1-cell
run("[->+<]", Map(0->10)) // Map will be 0 -> 0, 1 -> 10// copies content of the 0-cell to 2-cell and 4-cell
run("[>>+>>+<<<<-]", Map(0->42)) // Map(0 -> 0, 2 -> 42, 4 -> 42)// prints out numbers 0 to 9
run("""+++++[->++++++++++<]>--<+++[->>++++++++++<<]>>++<<----------[+>.>.<+<]""")
some more "useful" programs
// hello world program 1
run("""++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.""")
// hello world program 2
run("""++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.""")
// hello world program 3
run("""+++++++++[>++++++++>+++++++++++>+++++<<<-]>.>++.+++++++..+++.>-.------------.<++++++++.--------.+++.------.--------.>+.""")
// draws the Sierpinski triangle
run(load_bff("sierpinski.bf"))
bigger programs
// fibonacci numbers below 100
run("""+++++++++++ >+>>>>++++++++++++++++++++++++++++++++++++++++++++ >++++++++++++++++++++++++++++++++<<<<<<[>[>>>>>>+> +<<<<<<<-]>>>>>>>[<<<<<<<+>>>>>>>-]<[>++++++++++[- <-[>>+>+<<<-]>>>[<<<+>>>-]+<[>[-]<[-]]>[<<[>>>+<<< -]>>[-]]<<]>>>[>>+>+<<<-]>>>[<<<+>>>-]+<[>[-]<[-]] >[<<+>>[-]]<<<<<<<]>>>>>[+++++++++++++++++++++++++ +++++++++++++++++++++++.[-]]++++++++++<[->-<]>++++ ++++++++++++++++++++++++++++++++++++++++++++.[-]<< <<<<<<<<<<[>>>+>+<<<<-]>>>>[<<<<+>>>>-]<-[>>.>.<<< [-]]<<[>>+>+<<<-]>>>[<<<+>>>-]<<[<+>-]>[<+>-]<<<-]""")
// outputs the square numbers up to 10000
run("""++++[>+++++<-]>[<+++++>-]+<+[>[>+>+<<-]++>>[<<+>>-]>>>[-]++>[-]+ >>>+[[-]++++++>>>]<<<[[<++++++++<++>>-]+<.<[>----<-]<] <<[>>>>>[>>>[-]+++++++++<[>-<-]+++++++++>[-[<->-]+[<<<]]<[>+<-]>]<<-]<<-]""")
// calculates 2 to the power of 6 (example from a C-to-BF compiler at https://github.com/elikaski/BF-it)
run(""">>[-]>[-]++>[-]++++++><<<>>>>[-]+><>[-]<<[-]>[>+<<+>-]>[<+>-] <><[-]>[-]<<<[>>+>+<<<-]>>>[<<<+>>>-][-]><<>>[-]>[-]<<<[>>[-] <[>+>+<<-]>[<+>-]+>[[-]<-<->>]<<<-]>>[<<+>>-]<<[[-]>[-]<<[>+> +<<-]>>[<<+>>-][-]>[-]<<<<<[>>>>+>+<<<<<-]>>>>>[<<<<<+>>>>>-] <<>>[-]>[-]<<<[>>>+<<<-]>>>[<<[<+>>+<-]>[<+>-]>-]<<<>[-]<<[-] >[>+<<+>-]>[<+>-]<><[-]>[-]<<<[>>+>+<<<-]>>>-[<<<+>>>-]<[-]>[-] <<<[>>+>+<<<-]>>>[<<<+>>>-][-]><<>>[-]>[-]<<<[>>[-]<[>+>+<<-]> [<+>-]+>[[-]<-<->>]<<<-]>>[<<+>>-]<<][-]>[-]<<[>+>+<<-]>>[<<+> >-]<<<<<[-]>>>>[<<<<+>>>>-]<<<<><>[-]<<[-]>[>+<<+>-]>[<+>-]<> <[-]>[-]>[-]<<<[>>+>+<<<-]>>>[<<<+>>>-]<<>>[-]>[-]>[-]>[-]>[-]> [-]>[-]>[-]>[-]>[-]<<<<<<<<<<>>++++++++++<<[->+>-[>+>>]>[+[-<+ >]>+>>]<<<<<<]>>[-]>>>++++++++++<[->-[>+>>]>[+[-<+>]>+>>]<<<<< ]>[-]>>[>++++++[-<++++++++>]<.<<+>+>[-]]<[<[->-<]++++++[->++++ ++++<]>.[-]]<<++++++[-<++++++++>]<.[-]<<[-<+>]<<><<<""")
// a Mandelbrot set generator in brainfuck written by Erik Bosman (http://esoteric.sange.fi/brainfuck/utils/mandelbrot/)
run(load_bff("mandelbrot.bf"))
// a benchmark program (counts down from 'Z' to 'A')
run(load_bff("benchmark.bf"))
// calculates the Collatz series for numbers from 1 to 30
run(load_bff("collatz.bf"))