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How to swap two variables in JavaScript

I have this two variables:

var a = 1,
    b = 2;

My question is how to swap them? Only this variables, not any objects.

Solution

  • Here's a one-liner to swap the values of two variables.
    Given variables a and b:

    b = [a, a = b][0];

    Demonstration below:

    var a=1,
    b=2,
    output=document.getElementById('output');

output.innerHTML="<p>Original: "+a+", "+b+"</p>";

// swap values for variables "a" and "b"
b = [a, a = b][0];

output.innerHTML+="<p>Swapped: "+a+", "+b+"</p>";
    <div id="output"></div>