Muninn

What this page is

The editor runs Muninn. Not a recording of Muninn, and not a JavaScript imitation of it: the interpreter in src/ is compiled to WebAssembly and executes in this tab, so the output, the diagnostics, and the bytecode below are the ones the command line produces. The page draws them and holds no model of the language.

Edits are yours while you type, and nothing leaves the tab. The page is static: there is no server behind it, and there is no account, no history, and no stored program.

What this host allows

A script on a web page runs inside someone else's browser, so this host grants a smaller set of capabilities than the command line does. Muninn's builtins reach the host process for arguments, environment variables, files, the clock, and stdin; the table below says which ones this page lets through. The ones it does not trap with a policy error rather than failing quietly, and that trap is the program below the table.

Tensors

Muninn has a tensor type with broadcasting, matrix multiplication, and reductions. A printed tensor is drawn as a grid, because the shape is the point: tensor(shape=[2, 2], ...) is a two-by-two matrix, not four loose numbers.