JavaScript -=- Verify if a variable is NULL, undefined or empty

Hi!

To verify if a variable is null, undefined or empty in ExtJS, you could use

Ext.isEmpty( Mixed value, [Boolean allowBlank] ) : Boolean

Returns true if the passed value is null, undefined or an empty string (optional).

Parameters:

• value : Mixed
  The value to test
• allowBlank : Boolean
  (optional) Pass true if an empty string is not considered empty

Returns:

• Boolean