Demo here.

hit F10...

I have no programming knowledge!

• You are in the right place! Tutorial coming soon...

What is it?

• A language with debugger, editor, and heap vizualizer, made for teaching fudamental programming concepts: statements, functions, stack, heap, pointers, data structures.
• C teaches you how things work, but you don't have to learn C. Mono is a simpler, friendlier, but still powerful way to learn, without ever leaving the browser (chrome, and firefox with some pain, for now).
• Inspired by http://www.pythontutor.com/, https://schweigi.github.io/assembler-simulator/ and https://github.com/NeilFraser/JS-Interpreter.

What do the tools do?

Editor

• Common text editor shortcuts: go to definition, renaming, highlighting variable under cursor everywhere in scope, etc... see the full shortcut list.
• Prettifier.
• Syntax highlighting.
• Auto closing brackets & indentation.

Debugger

• Step over, into, continue, stop.
• Change variables while debugging (supports any expression).

Heap vizualizer

• Drag & zoom.
• Will start from each local variable in the top stackframe and recursively draw a tree as it finds pointers. See the demo. So it shows only the addressed that can be read starting from the top stackframe.

What's the language like?

The good

• Like C, but with only one type, number (int), and arrays and strings built on top.
• Arrays (but, only on the heap). When you write [1,2,3] a number is returned as an address and you get the first element with a[0]. Effectively pointers, but only to arrays.
• someArray[-1] gets you the last index, and someArray[len(someArray)] get you the first, etc.
• String literals are equivalent to an array initializer that contains the ASCII code.
• Pointers to functions and lambdas.
• Closures.
• A handful of native functions: push,len,readLine,print,printa(treats the argument as an array address),prints(just like print)
• A tiny standard library inspired from js: map,reduce,concat...

The bad

• No enum, union, do-while, switch.
• No garbage collection and no method to free memory either (subject to change). Don't try to do a big for loop with an array initialization inside.
• Very, very slow. Probably you won't get out of memory because you'll get bored earlier. (Plan on writing a VM instead of a the current, slow AST walker).
• L-value expresions are a bit broken for now, you can only do identifier followed by optional indexing operators and one optional paranthesis at the end. See /lang/grammar .
• Expressions don't behave exactly as they usually do ( '0 && callSomeFunction()' will actually call it).

The ugly

• No . operator / no structs. There's only one data type and arrays will do. I admit you get tired of node[0] instead of node.left after a while.

Dependencies

• The awesome HyperApp, no JSX, all vanilla ES6.
• vis.js (for the heap vizualizer).
• Yup, that's it.

Full shortcut list

Debugger

• f7: stop
• f8: run/continue
• f10: step over
• f11: step into

Quality of life

• f2: rename
• ctrl + f12: go to refinition
• alt + f: preffify
• ctrl+g: go to line
• ctrl+l: delete line

Basic

• ctrl+z, ctrl+y: undo/redo
• arrows (+ shift) + home/end: navgiationA language with debugger, editor, and heap vizualizer, made for teaching fudamental programming concepts without having to go through something like C.
• ctrl+a, ctrl+c, ctrl+x, ctrl+v: copy-paste stuff