Question

I have a simple if statement

if(variable == null) 

does not enter the statement

if(variable == "") 

does

Why does this happen??
What is the difference between “” and null in javascript

Answer 1

"" is the empty string. In other words, it’s a string of length 0. null on the other hand is more like a generic placeholder object (or an object representing the absence of an object). There’s also undefined which is different from both "" and null.

But the point is, "" != null so therefore:

var s = "";
s == null; // false
s == ""; // true