GROL

Go Repl Open Language is a small interpreted (for now) language implemented in Go.

Initially loosely based on Monkey from the Writing an Interpreter in Go book but fully re designed and reimplemented since. See more on github. Or try the wasm version right below, type info for all the functions and keywords (and we also have a discord bot).

See releases to get the command line version with and interactive repl, history, edit of previous lines, etc…

See the butterfly demo of generating images from grol in wasm.

Edit the sample/Enter your GROL code here: println("Outputting a smiley: 😀") func fact(n) { // function example, name is optional log("called fact ", n) // log output // parenthesis are optional: if (n<=1) { return 1 } n*fact(n-1) // recursion } a=[fact(5), "abc", sqrt(2)] // heterogeneous array, math functions /* maps also can have any key,value types: */ m={"str key": a, PI: "pi", 42: "str val", 1e3: "a lot"}

Hit enter or click (will also format the code, also try compact)

Result:

Errors:

GROL