Null, Undefined, Empty Checks Shorthand When creating new variables sometimes you want to check if the variable your referencing for it’s value isn’t null or undefined. I would say this is a very common check for JavaScript coders.

null.js

if (variable1 !== null || variable1 !== undefined || variable1 !== '') {
     var variable2 = variable1;
}

//short hand
var variable2 = variable1  || '';

you should declare variable1 first