Checking if undefined and null in jQuery

javascript, jquery, ternary-operator

Solution

Both `null` and `undefined` are "falsy" values, thus they can be checked like they were boolean values. Thus, there's no sense comparing to `null` and `undefined` except for certain situations where you need to know if they are such values.

when comparing, it's best to use strict comparison (like `===`,`!==` and so on)

the `&&` in a condition does not evaluate the following condition if the one preceeding it is "falsy".

You don't even need jQuery since `this` is your DOM object (presumably an `<a>`) and you are trying to get the `target` property:

In the end:

var c = (this.target && this.target.toLowerCase() === "_blank") ? 1 : 0;

Problem

I'm a bit confused when checking if null or undefined and if I should be using `!==` or `!=` and "undefined" or undefined. Here is some code I'm working on. Where am I going wrong with my null/unudefined etc? ``` var c = (jQuery(this).prop("target") != null && jQuery(this).prop("target") != undefined && jQuery(this).prop("target").toLowerCase() == "_blank") ? 1 : 0; ``` Thanks

Original source