Removing “NUL” characters
This might help, I used to fi my files like this: http://security102.blogspot.ru/2010/04/findreplace-of-nul-objects-in-notepad.html Basically you need to replace \x00 characters with regular expressions
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How to check if object is null or not except == null
The easiest way to check is entity == null. There is no shorter way to do that. Note that there is a method for this in the standard lib: Objects.isNull(Object obj) And another one which is the opposite of the above one: Objects.nonNull(Object obj) And there is yet another one which can be used to force … Read more
Origin null is not allowed by Access-Control-Allow-Origin
Origin null is the local file system, so that suggests that you’re loading the HTML page that does the load call via a file:/// URL (e.g., just double-clicking it in a local file browser or similar). Most browsers apply the Same Origin Policy to local files by disallowing even loading files from the same directory as the document. (It used to be that … Read more
Check if C++ Array is Null
Actually, when you have an array a[SIZE], you can always check: But it’s not necessary, unless you created a dynamic array (using operator new). See the other answers, I won’t delete it just because it’s accepted now. If other answer is accepted, I’ll delete this “answer”. EDIT (almost 4 years later 🙂 ) As I … Read more
C++ – Assigning null to a std::string
I can’t assign a null to a String? No. std::string is not a pointer type; it cannot be made “null.” It cannot represent the absence of a value, which is what a null pointer is used to represent. It can be made empty, by assigning an empty string to it (s = “” or s = std::string()) or by clearing … Read more
What is the difference between null and undefined in JavaScript?
In JavaScript, undefined means a variable has been declared but has not yet been assigned a value, such as: null is an assignment value. It can be assigned to a variable as a representation of no value: From the preceding examples, it is clear that undefined and null are two distinct types: undefined is a type itself (undefined) while null is an object. and
Check if object exists in JavaScript
You can safely use the typeof operator on undefined variables. If it has been assigned any value, including null, typeof will return something other than undefined. typeof always returns a string. Therefore
What is a ‘NoneType’ object?
NoneType is the type for the None object, which is an object that indicates no value. None is the return value of functions that “don’t return anything”. It is also a common default return value for functions that search for something and may or may not find it; for example, it’s returned by re.search when the regex doesn’t match, or dict.get when the key has … Read more
Returning null in a method whose signature says return int?
int is a primitive, null is not a value that it can take on. You could change the method return type to return java.lang.Integer and then you can return null, and existing code that returns int will get autoboxed. Nulls are assigned only to reference types, it means the reference doesn’t point to anything. Primitives are not reference … Read more
What is the PHP syntax to check “is not null” or an empty string?
Null OR an empty string? Use empty(). After realizing that $user ~= $_POST[‘user’] (thanks matt):