JavaScript check if value is only undefined, null or false

Question

Other than creating a function, is there a shorter way to check if a value is undefined,null or false only in JavaScript?

Answer 1

Try like Below

var Boolify = require('node-boolify').Boolify;
if (!Boolify(val)) {
    //your instruction
}

Refer node-boolify

Answer 2

Well, you can always "give up" :)

function b(val){
    return (val==null || val===false);
}

Answer 3

only shortcut for something like this that I know of is

var val;
(val==null || val===false) ? false: true;