tstpierre/jsbin.qadelake.html

## jsbin.qadelake.html
<!DOCTYPE html>
<html>
<head>
<meta name="description" content="[add your bin description]" />
  <meta charset="utf-8">
  <title>JS Bin</title>
  <script src="http://cdnjs.cloudflare.com/ajax/libs/mathjs/0.18.1/math.min.js" type="text/javascript"></script>
</head>
<body>

</body>
</html>

## jsbin.qadelake.js
var math = mathjs();

var entity = {
  val1: 3,
  val2: 2,
  val3: 6,
  formula: "{0} * {1}",
  replacements: "val1,val2"
};

var args = entity.formula.match(/\{(\d+)\}/g);
var rpls = entity.replacements.split(",");
var compiledFormula = entity.formula;

console.log("Arguments from entity: " + args);
console.log("Replacements from entity: " + rpls);

args.forEach(function(a) {
  var index = parseInt(a.match(/(\d+)/g)[0], 10);
  compiledFormula = compiledFormula.replace(a, entity[rpls[index]]);
});

var result = math.eval(compiledFormula);
console.log(compiledFormula + " = " + result);
	<!DOCTYPE html>
	<html>
	<head>
	<meta name="description" content="[add your bin description]" />
	<meta charset="utf-8">
	<title>JS Bin</title>
	<script src="http://cdnjs.cloudflare.com/ajax/libs/mathjs/0.18.1/math.min.js" type="text/javascript"></script>
	</head>
	<body>

	</body>
	</html>
	var math = mathjs();

	var entity = {
	val1: 3,
	val2: 2,
	val3: 6,
	formula: "{0} * {1}",
	replacements: "val1,val2"
	};

	var args = entity.formula.match(/\{(\d+)\}/g);
	var rpls = entity.replacements.split(",");
	var compiledFormula = entity.formula;

	console.log("Arguments from entity: " + args);
	console.log("Replacements from entity: " + rpls);

	args.forEach(function(a) {
	var index = parseInt(a.match(/(\d+)/g)[0], 10);
	compiledFormula = compiledFormula.replace(a, entity[rpls[index]]);
	});

	var result = math.eval(compiledFormula);
	console.log(compiledFormula + " = " + result);