How to take plus sign in variable

Question

I want to calculate two numbers and its pretty simple.

But Is there any way to take operator in variable and then do the calculation?

var x = 5;
var y = 5;
var p = '+';
var z = x + p + y;

$(".button").click(function() {
  alert(z);
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="button">Click ME !</div>

Answer 1

Avoid eval whenever possible. For this example, a simple switch...case statement will be sufficient:

var x = 5;
var y = 5;
var z;
var p = "+";
switch (p) {
    case "+":
        z = x + y;
        break;
    case "-":
        z = x - y;
        break;
}

---

You can also use a map of functions:

var fnlist = {
    "+": function(a, b) { return a + b; },
    "-": function(a, b) { return a - b; }
}
var x = 5;
var y = 5;
var p = "+";
var z = fnlist[p](x, y);