Demo here.

hit F10...

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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