In JavaScript, no string is equal to null. Maybe you expected pass == null to be true when pass is an empty string because you're aware that the loose equality operator == performs certain …

In order to understand, Let's analyze what will be the value return by the Javascript Engine when converting undefined , null and '' (An empty string also). You can directly check the same on …

The null (ish) coalescing operator only works with null and undefined. So, use the null (ish) coalescing operator when you don't want those values but you will otherwise accept other …

Is there a string.Empty in JavaScript, or is it just a case of checking for ""?

Apr 29, 2009 · In JavaScript, one difference is that null is of type object and undefined is of type undefined. In JavaScript, null==undefined is true, and considered equal if type is ignored.

May 21, 2013 · It's mnemonic Javascript way to check if data variable evaluates to true. undefined, null, false, 0, empty string, empty array and (?)object with no properties evaluates …

Feb 24, 2011 · How do I check a variable if it's null or undefined and what is the difference between the null and undefined? What is the difference between == and === (it's hard to …

Apr 25, 2013 · 42 Your global.User is undefined, not null. When using == they evaluate to equal, but with === the items you are comparing need to be the same type. undefined has the type …

3. If Type(x) is Null, return true. So, only if Type(a) is Null, the comparison returns true. Important: Don't confuse the internal Type function with the typeof operator. typeof null would actually …

Jan 25, 2009 · JavaScript now supports the nullish coalescing operator (??). It returns its right-hand-side operand when its left-hand-side operand is null or undefined, and otherwise returns …