is there any function like string.isnullorempty() in javascript

Question

I always (thing != undefined || thing != null)?...:...; check. Is there any method will return bool after this check in javascript or jquery ?

And how would you add this check in jquery as a function?

Answer 1

if (thing)
{
   //your code
}

Is that what you are looking for?

Answer 2

In Javascript, the values null, undefined, "", 0, NaN, and false are all "falsy" and will fail a conditional.
All other values are "truthy" and will pass a conditional.

Therefore, you can simply write thing ? ... : ....