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/>mpl requires CMake and a C++ compiler to build, rlwrap is highly recommended for running the REPL.

$ cd ampl
$ mkdir build
$ cd build
$ cmake ..
$ make
$ rlwrap ./ampl
/>mpl v5

Press Return on empty line to evaluate.

May the Source be with you!

  func fib (n Int) (Int) 
    if < n 2 n + fib - n 1 fib - n 2
  fib 10
  
[55]

cp may be used to copy the top value.

  1 2 3 cp

[1 2 3 3]

d may be used to drop values.

  1 2 3 4 5 ddd

[1 2]

  d

[1]

if may be used to branch on a condition.
All values have boolean representations; most are true; but 0, empty strings etc. are false.

  if 42 'yes 'no

['yes]

New functions may be defined using func.

  func foo () (Int) 42

[]
  foo

[42]

Values may be dumped to cout using dump.

  dump 42

42
[]

/>mpl currently runs around around 5 times as slow as Python3.

bench returns elapsed time in ms for running its body n times.

  func fib (n Int) (Int)
    if < n 2 n + fib - n 1 fib - n 2
  bench 100 (fib 20 d)

[1233]