JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id="text" cols="40" rows="10"></textarea>
<br/>
<button onclick="compile()">Compile</button>
<br/>
<textarea id="compiledArray"  cols="40" rows="10" readonly></textarea>

JavaScript

window.compile = function()
{
    var lines = $("#text").val().toLowerCase().match(/[^\r\n]+/g);
	var stack = [];
	for (var i = 0; i < lines.length; i++)
		compileLine(lines[i], stack);

	var output = "";
	for (var i = 0; i < stack.length; i++)
		if (typeof stack[i] == "string")
			output += "\n";
		else
			output += "0x" + stack[i].toString(16) + " ";

	$("#compiledArray").val(output);

}

window.compileLine = function(line, stack){
	var params = line.split(" ")
	
	if (params[0] == "load"){
		stack.push(0);
		stack.push(getInt(params[1]));
		stack.pushArr(getInt(params[2]));
	}

	if (params[0] == "rload"){
		stack.push(1);
		stack.push(getInt(params[1]));
		stack.push(getInt(params[1]));
	}

	if (params[0] == "push"){
		stack.push(2);
		stack.push(getInt(params[1]));
	}

	if (params[0] == "pop"){
		stack.push(3);
		stack.push(getInt(params[1]));
	}

	if (params[0] == "add"){
		stack.push(4);
		stack.push(getInt(params[1]));
		stack.push(getInt(params[2]));
	}

	if (params[0] == "sub"){
		stack.push(5);
		stack.push(getInt(params[1]));
		stack.push(getInt(params[2]));
	}

	if (params[0] == "mul"){
		stack.push(6);
		stack.push(getInt(params[1]));
		stack.push(getInt(params[2]));
	}

	if (params[0] == "div"){
		stack.push(7);
		stack.push(getInt(params[1]));
		stack.push(getInt(params[2]));
	}

	if (params[0] == "jmp"){
		stack.push(8);
		stack.pushArr(getInt(params[1]));
	}

	if (params[0] == "cmp"){
		stack.push(9);
		stack.push(getInt(params[1]));
		stack.push(getInt(params[2]));
	}

	if (params[0] == "branchlt"){
		stack.push(10);
		stack.pushArr(getInt(params[1]));
	}

	if (params[0] == "brancheq"){
		stack.push(11);
		stack.pushArr(getInt(params[1]));
	}

	if (params[0] == "branchgt"){
		stack.push(12);
		stack.pushArr(getInt(params[1]));
	}

	if (params[0] == "branchne"){
		stack.push(13);
		stack.pushArr(getInt(params[1]));
	}
    
    stack.push("NEW LINE");
}

window.getInt = function(x) {
    if (x.trim().startsWith("<--"))
        return "COMMENT";

  ...