check if JS object exists
<p>I need to discover at runtime if an object with a given name exists, but this name is stored in a variable as a string.</p>

<p>For example, in my Javascript I have an object named test, then at runtime I write the word "text" in a box, and I store this string in a variable, let's name it input. How can I check if a variable named with the string stored in input variable exist?</p>
