In JavaScript, can you change an element’s attribute value to a variable?

Question

When changing an attribute of an HTML element, can you set the attribute value to a predefined variable in JavaScript?
For example:

var elem = document.getElementByTagName(“div”);
desiredHeight = “100px”;
elem[0].style.height = desiredHeight;

I know that in this simplified example you wouldn’t need a variable if it was always going to be 100px, but mine varies in the code so i was wondering if using a string variable would work when setting and element’s attribute?

Answer 1

Yes of course "100px" is a string just like
var myVar = "100px";