A string as part of an expression

How can I pass a part of an expression as an argument as a string? Something like this:

let t = "val";
$('.class').t();

UPD

UPD 2

My mistake, I was just redefining an already declared variable.

>Solution :

You can use Bracket notation to access the property of an object dynamically:

let t = "val";
$('.class')[t]();

This will call the method with the name that matches the value of the t variable on the jQuery object with the class. If the method exists on the object, it will be called with the appropriate arguments.