Javascript Object notation with variable

Question

My PHP script specs.php outputs the following:

{
    \"hd\": {
        \"dimensions\": [
            \"1920x1080\",
            \"1920x1080\",
            \"         


        

Answer 1

You can't use a variable in the dot notation, but you can use brackets notation:

var size = specs_obj[preset].sizes[0];

If preset contains the string "medium", that's functionally identical to:

var size = specs_obj.medium.sizes[0];