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HTML

              
                <h1>CGL (CGL Golfing Language)</h1>
<h2>Code</h2>
<textarea></textarea>
<h2>Input</h2>
<button>Add input</button>
<div id = "input">
</div>
<button id = "run">Run</button>
<h2>Output</h2>
<div id = "output"></div>
              
            
!

CSS

              
                textarea,button, input{
	display: block;
}
textarea,div:not(#input){
	width: 100%;
	resize: vertical;
	box-sizing: border-box;
	min-height: 200px;
	border: 1px solid black;
}
button, input{
	width: 20%;
	margin: 10px auto;
}
h1,h2{
	text-align: center;
}
              
            
!

JS

              
                var copyTextToClipboard = function(text) {
  var textArea = document.createElement("textarea");

  //
  // *** This styling is an extra step which is likely not required. ***
  //
  // Why is it here? To ensure:
  // 1. the element is able to have focus and selection.
  // 2. if element was to flash render it has minimal visual impact.
  // 3. less flakyness with selection and copying which **might** occur if
  //    the textarea element is not visible.
  //
  // The likelihood is the element won't even render, not even a flash,
  // so some of these are just precautions. However in IE the element
  // is visible whilst the popup box asking the user for permission for
  // the web page to copy to the clipboard.
  //

  // Place in top-left corner of screen regardless of scroll position.
  textArea.style.position = 'fixed';
  textArea.style.top = 0;
  textArea.style.left = 0;

  // Ensure it has a small width and height. Setting to 1px / 1em
  // doesn't work as this gives a negative w/h on some browsers.
  textArea.style.width = '2em';
  textArea.style.height = '2em';

  // We don't need padding, reducing the size if it does flash render.
  textArea.style.padding = 0;

  // Clean up any borders.
  textArea.style.border = 'none';
  textArea.style.outline = 'none';
  textArea.style.boxShadow = 'none';

  // Avoid flash of white box if rendered for any reason.
  textArea.style.background = 'transparent';


  textArea.value = text;

  document.body.appendChild(textArea);

  textArea.select();

  try {
    var successful = document.execCommand('copy');
    var msg = successful ? 'successful' : 'unsuccessful';
    console.log('Copying text command was ' + msg);
  } catch (err) {
    console.log('Oops, unable to copy');
  }

  document.body.removeChild(textArea);
};

function prime(num){
 if(num == 1) return true;
 var t = num / 2;
 var k = 2;
 while(k <= t) {
   if(num % k == 0) {
      return false
   } else {
   k++;  
  }
 }
  return true;
}

if (!Math.cbrt) {
  Math.cbrt = function(x) {
    var y = Math.pow(Math.abs(x), 1/3);
    return x < 0 ? -y : y;
  };
}

if (!Math.root4) {
  Math.root4 = function(x) {
    var y = Math.pow(Math.abs(x), 1/4);
    return x < 0 ? -y : y;
  };
}

var $ = function(selector){
	return document.querySelector(selector);
};

var stacks;
var stackOn;
var isString;
var isComment;
var string;
var isNumber;
var number;
var isCompString;
var compString;

var clear = function(){
	stacks = [[]];
	stackOn = 0;
	isString = false;
	isComment = false;
	isNumber = false;
	isCompString = false;
	compString = "";
	string = "";
	number = "";
};

clear();

Array.prototype.rotate = function(n){
	this.unshift.apply(this, this.splice(n, this.length));
	return this;
};

var functions = {
	"\n": function(){
		isComment = false;
	},
	
	"!": function(){
		stacks[stackOn].forEach((item, idx)=>{
			var currentStack = stacks[stackOn];
			switch(typeof item){
				case "number":
					//invert sign (from -2 to 2, and 3 to -3)
					currentStack[idx] = item * -1;
				break;
				case "boolean":
					currentStack[idx] = !currentStack[idx];
				break;
				case "string":
					//something like "1"
					if(parseInt(item)){
						//invert sign (from -2 to 2, and 3 to -3)
						currentStack[idx] = item * -1;
					}
				break;
			}
		});
	},
	
	"\"": function(){
		if(isString){
			stacks[stackOn].push(string);
			string = "";
		}
		isString = !isString;
	},
	
	//numbers are stored as strings internally
	"#": function(){
		if(isNumber){
			console.log(number);
			stacks[stackOn].push(parseInt(number));
			number = "";
		}
		isNumber = !isNumber;
	},
	
	"$": function(){
		//our rotate function is backwards
		stacks[stackOn].rotate(1);
	},
	
	"%": function(){
		//our rotate function is backwards
		stacks[stackOn].rotate(-1);
	},
	
	"&": function(){
		stacks[stackOn].forEach((item, idx)=>{
			var currentStack = stacks[stackOn];
			currentStack[idx] = LZString.compress(item);
		});
	},
	
	
	"'": function(){
		if(isCompString){
			stacks[stackOn].push(LZString.decompress(compString));
			compString = "";
		}
		isCompString = !isCompString;
	},
	
	//add 2 because a stack shift of 0 is a no-op and 1 has its own char
	"(": function(){
		stackOn -= parseInt(stacks[stackOn].find(element=>{
			return !isNaN(parseInt(element));
		})) + 2;
		stacks[stackOn] = stacks[stackOn] || [];
	},
	
	//add 2 because a stack shift of 0 is a no-op and 1 has its own char
	")": function(){
		stackOn += parseInt(stacks[stackOn].find(element=>{
			return !isNaN(parseInt(element));
		})) + 2;
		stacks[stackOn] = stacks[stackOn] || [];
	},
	
	
	//increment current stack
	"+": function(){
		stackOn ++;
		stacks[stackOn] = stacks[stackOn] || [];
	},
	
	//decrement current stack
	"-": function(){
		stackOn --;
		stacks[stackOn] = stacks[stackOn] || [];
	},
	
	//delibrate no-op
	"/": function(){},
	
	":": function(){
		var temp = stacks[stackOn].toString().split("");
		stackOn++;
		stacks[stackOn] = temp;
	},
	
	"L": function(){
		var gcd=(a,b)=>b?gcd(b, a % b):a;
		lcm = (a,b)=>(a*b)/gcd(a,b);
		stacks[stackOn].push(
			lcm(parseInt(stacks[stackOn][0]),parseInt(stacks[stackOn][1]))
		);
	},
	
	"S": function(){
		var copy = [...stacks[stackOn]].sort();
		stackOn++;
		stacks[stackOn] = copy;
	},
	
	"c": function(){
		var same = JSON.stringify(stacks[stackOn]) === JSON.stringify(stacks[stackOn - 1]);
		stackOn ++;
		stacks[stackOn] = stacks[stackOn] || [];
		stacks[stackOn].push(same);
	},
	
	"h": function(){
		stacks[stackOn].push("Hello, World!");
	},
	
	//non-breaking space starts comment - perfect for polyglots
	"\u00a0": function(){
		isComment = true;
	},
	
	"²": function(){
		stacks[stackOn].forEach((item, idx)=>{
			stacks[stackOn][idx] = item ** 2;
		});
	},
	
	
	"³": function(){
		stacks[stackOn].forEach((item, idx)=>{
			stacks[stackOn][idx] = item ** 3;
		});
	},
	
	
	"⁴": function(){
		stacks[stackOn].forEach((item, idx)=>{
			stacks[stackOn][idx] = item ** 4;
		});
	},
	
	"➕": function(){
		stacks[stackOn][0] = parseInt(stacks[stackOn][0]);
		stacks[stackOn][0] += stacks[stackOn][1] ? parseInt(stacks[stackOn][1]) : 1;
	},
	
	"₂": function(){
		stacks[stackOn].forEach((item, idx)=>{
			stacks[stackOn][idx] = Math.sqrt(item);
		});
	},
	
	
	"₃": function(){
		stacks[stackOn].forEach((item, idx)=>{
			stacks[stackOn][idx] = Math.cbrt(item);
		});
	},
	
	
	"÷": function(){
		if(stacks[stackOn][1] !== undefined){
			stacks[stackOn].push(stacks[stackOn][0] / stacks[stackOn][1]);
		}else{
			stacks[stackOn].push(1/stacks[stackOn][0]);
		}
	},
	
	"₄": function(){
		stacks[stackOn].forEach((item, idx)=>{
			stacks[stackOn][idx] = Math.root4(item);
		});
	},
	
	"ⓟ": function(){
		stacks[stackOn].forEach((item, idx)=>{
			stacks[stackOn][idx] = prime(item);
		});
	},
	
	"Ⓧ": function(output){
		stacks[stackOn] = [stacks[stackOn].pop()];
	},
	
	"ⓧ": function(output){
		stacks[stackOn] = [stacks[stackOn][0]];
	},
	
	"☒": function(){
		stacks[stacksOn].pop();
	},
	
	"☑": function(){
		stacks[stacksOn] = [stacks[stacksOn].pop()];
	},
	
	//not a "normal +"
	"+": function(){
		stacks[stackOn].push(parseInt(stacks[stackOn][0]) + parseInt(stacks[stackOn][1]));
	},
	
	//not a "normal letter x"
	"✕": function(){
		stacks[stackOn].push(parseInt(stacks[stackOn][0]) + parseInt(stacks[stackOn][0]));
	},
	
	
	"⨥": function(){
		var temp = JSON.parse(JSON.stringify(stacks[stackOn])).reduce((accum, item)=>parseInt(accum)+parseInt(item));
		console.log(temp);
		stackOn ++;
		stacks[stackOn].push(temp);
	},
	
	/*
	
	"!": function(){
	},
	*/
	
};

var run = function(code, inputArr, output){
	stacks[-1] = inputArr;
	var hasReturned = code.split("").some(char=>{
		
		//add string chars
		if(isString && char !== "\""){
			string += char;
		//add compressed string chars
		}else if(isCompString && char !== "'"){
			compString += char;
		//add number chars
		}else if(isNumber && char !== "#"){
			//using a non-number char with a current number results in ending that number and parsing normally
			if(char === "0" || parseInt(char) || char === "." || (char === "-" && number === "")){
				number += char;
			}else{
				console.log("Ending #");
				
				//call the # function to end this number
				functions["#"]();
				
				if(!isComment || char === "\n"){
					//check if function exists
					if(functions[char]){
						return functions[char]();
					}
				}
			}
		}else if(!isComment || char === "\n"){
			//check if function exists
			if(functions[char]){
				return functions[char]();
			}
		}
	});
	
	//"adds" a " for you if you leave one out
	if(isString){
		functions["\""]();
	}
	
	//"adds" a ' for you if you leave one out
	if(isCompString){
		functions["'"]();
	}
	
	//"adds" a # for you if you leave one out
	if(isNumber){
		functions["#"]();
	}
	
	if(!hasReturned){
		output(stacks[stackOn][0] === undefined ? "" : stacks[stackOn][0]);
	}
};
$("#run").onclick = function(){
	$("#output").innerText = "";
	clear();
	var inputs = Array.from(document.querySelectorAll("input"));
	var inputValues = [];
	inputs.forEach(input=>inputValues.push(input.value));
	console.log(inputValues, inputs);
	run($("textarea").value, inputValues, function(output){
		$("#output").innerText += output;
	});
};

$("button").onclick = function(){
	$("#input").appendChild(document.createElement("input"));
};

var isUnicodeShortcut = false;
var unicode = "";

//unicode shortcut - press Control + Shift + U and enter in the hex of a unicode char, press enter and it will copy to your clipboard.
$("textarea").onkeydown = function(e){

	if(isUnicodeShortcut){
		e.preventDefault();
	}
	
	if(e.key === "Enter" && isUnicodeShortcut){
		var char = String.fromCharCode(parseInt(unicode, 16));
		console.log("Ending shortcut with " + char);
		isUnicodeShortcut = false;
		if(!copyTextToClipboard(char)){
			prompt("Control + C, Enter", char);
		}
		
	}else if(isUnicodeShortcut){
		
		console.log("Unicode shortcut adding " + e.key);
		unicode += e.key;
		
	}else if(e.ctrlKey && e.key === "U"){
		console.log("Ctrl + shift + u")
		isUnicodeShortcut = true;
	}
};
              
            
!
999px

Console