Questions tagged [null]

This tag should be used for questions where you are handling null variables or values.

Filter by
Sorted by
Tagged with
-4
votes
1answer
93 views

Determining request status

This code gets request status based on request type and some mapping info. I'm wondering if there is a way to write nice conditional expressions in if statement. Expression should test if ...
-1
votes
3answers
101 views

Return array or null result for application of a command to a list

I have such method: ...
14
votes
8answers
21k views

IsNullOrWhiteSpace check for Java

I am needing to write my own IsNullOrWhiteSpace check for Java but am wondering if this is the best method to do so ...
6
votes
1answer
990 views

Detecting gyroscope data using promises

In a plugin that I am currently authoring, I am using a function to check whether the device provides gyroscopic data. Although intuitively this can be easily resolved by checking the value of ...
2
votes
1answer
205 views

Handle NullValueInNestedPathException

I am looking for a elegant solution to this. I am new to Spring framework. I have a method: ...
5
votes
1answer
340 views

Multiple functions to establish a fallback value for a property until not null

I have a property (called "Head") that can be set externally. When "Head" is not set, it uses Unity3D's MonoBehaviour functions to try to find the best value for "...
5
votes
1answer
419 views

Maybe getting a character from a list of strings

I'm trying to transition from JavaScript to PureScript (a Haskell spinoff that transpiles to JavaScript). For starters I coded this: ...
7
votes
3answers
258 views

Enumerating new articles whose publication start date has passed

(cn.PublishEnd == null || cn.PublishEnd < DateTime.Now) vs (cn.PublishEnd ?? DateTime.MinValue < DateTime.Now) Which ...
1
vote
2answers
174 views

Checking for null in delivery functions

In my Repository class: ...
4
votes
2answers
210 views

Verifying value before parsing

I am writing some Java code and am coming across a try/catch block in which I decided to verify the value is not null before parsing it: ...
1
vote
1answer
31 views

Argument order with default value

I have a library with two methods: one takes an object and vararg strings, the other takes a default value as well. They are currently implemented as: ...
0
votes
1answer
149 views

Checking a value before assigning it to variable

Throughout my code, I find myself testing if the output of a function is undefined or blank before i use the output. In this case, getQuery checks if the property of an object is either blank or if ...
3
votes
1answer
37 views

Return most recent non null field values for multiple unknown fields

I am attempting to create a stored procedure that looks at one table and imports changes in that table to another. This stored procedure is going to be preformed on multiple source tables and will ...
7
votes
2answers
431 views

Handling optional parameters in a servlet

I have a form that submits to a servlet that has optional parameters. If they are empty they are just ignored. This is the template I am using: ...
2
votes
1answer
58 views

Returning the next node

What is considered to be a good programming practice for returning value from the function? For example, if we have a function in C named ...
2
votes
1answer
206 views

Alternative to null check after DOM traversal?

I have this code working, but I'm not sure if it's the best way to write it. I was watching a JS talk on Maintainable JavaScript, and saw that I probably shouldn't be comparing my element to null, ...
5
votes
2answers
25k views

C# approach to prevent null references in strings

My insight here is that it's usually not useful to distinguish between null and empty strings. Sometimes it is, but usually not. Usually I like to assign my strings ...
3
votes
0answers
66 views

Basic Binary Tree in Go

As an exercise I have written a basic binary tree implementation in Go. Tree struct: ...
3
votes
1answer
101 views

Implementing a binary operation for the null object pattern

Today I needed to implement a class for representing rectangular regions with some binary operations such as merging or intersection. ...
4
votes
3answers
207 views

Classifying rows of data by the number of days to close

DataTable looks like below I would like to simplify this code in a better manner. ...
5
votes
2answers
184 views

Detecting change of a name or a part

We have a fair amount of code which looks like this: ...
11
votes
2answers
100k views

Check if any of class properties is not null/empty/was assigned

I have a class that I use to display on a web page fieldset. However, all of the properties of this class are optionally filled in by the user, which means all of them could be null/default. In this ...
2
votes
2answers
2k views

Gather first letter from each string in a list of strings

I'm learning Haskell on my own, and I'm wondering if this is idiomatic Haskell. In particular: is it a common pattern to "wrap" the result in a list in order to make a function total? (that's what I ...
1
vote
4answers
71 views

Defaulting parameters to false

In my rails controllers, I am consistently using this logic: ...
6
votes
3answers
55k views

Cast an object to Decimal? or Int? etc but leave it as null if it is null

In a case like this: object A1 = null; Decimal? B = Convert.ToDecimal(A1); object A2 = null; int? C = Convert.ToInt32(A2); Note that in case where ...
3
votes
1answer
64 views

MySQL case statement with two tables

How can I improve the following working SQL statement for better performance and consistency? ...
7
votes
2answers
663 views

Use different contructors of disposable class

I have a very simple helper class to validate credentials. Sometimes the domain has a value, sometimes not. Depending on this, a different constructor for ...
2
votes
2answers
1k views

Assign Specific Value If BitField Is True

My colleague created this SQL to handle certain user selections which are based on an on/off bit flag. The goal is to identify those individual bit flags with a specific integer which will be used in ...
8
votes
2answers
843 views

Idiomatic Scala try option code block

Basically, this function returns a list of flights for an airline. But if the airline doesn't exist, I want to throw some custom runtime exception. If that airline does exist, I want to return a list ...
1
vote
2answers
107 views

Domain object toString null check

Following advice to "Make good use of toString() for all Domain classes", I made what I thought was the most useful toString ...
11
votes
4answers
2k views

Writing null-safe code to set form values

I will ask my question using the following example: HTML ...
3
votes
1answer
187 views

Correct practice for Python properties that depend on other attributes

When a property is essentially a boolean value for whether or not an attribute exists or is set a certain way, is it more appropriate to create an object that does not list the option attribute in its ...
5
votes
4answers
1k views

NULL-eating / elimination version of fgets() in C

I've come up with the following routine to read data from a file stream, but I don't want any NULLs in the stream to terminate the string early. This function will ...
7
votes
3answers
238 views

Creating check parameter class instead of repetitive null checks

What I'm trying to accomplish is to have a error checking class mostly to check if parameters that are pass null but also data structures within class are not null. So my thought is a clean static ...
7
votes
3answers
280 views

Too many null checks in an XML-to-XML transformation

I'm writing a conversion mechanism in C#. I deserialize a big XML document of one type and return a big XML document of another type (via serialization of another object). While I'm doing the ...
1
vote
1answer
8k views

Null checking in nested getter calls [closed]

I have the following piece of code and I would like to see what different approaches would be to solve that in a more elegant way. The thing is that I don't know whether is better to have the null ...
2
votes
2answers
3k views

Using Common Table Expression and Outer queries

In following query I'm use both Common Table Expression and Outer queries. Apparently both looks same to me. If I summarize my requirement, I have employees in ...
8
votes
2answers
632 views

PHP isset over use? Good or bad?

First, I'm in no way an experienced PHP coder. This is my 5th time working with PHP, so if you see anything that can bee improve, please point them out for me. I have the code checking for the ...
7
votes
1answer
2k views

Getting matching items in lists based on nullable properties

I'm iterating through two lists to find matching objects. The objects have two string properties, Id1 and Id2 below. If ...
10
votes
1answer
226 views

Organization data class

I believe I have made the following data class quite decently, and I'd like a thorough review on it. The code is built on Java 8 and uses the Builder and Serialization Proxy pattern, it is used to ...
4
votes
1answer
275 views

Is checking for null redundant while using Contract Annotator from JetBrains?

I'm curious whether checking for null is redundant in this concrete example. ...
4
votes
4answers
1k views

Instantiating if null

I often have static classes which uses the DataContext somehow, and they all make a new DataContext, but often I already have ...
3
votes
2answers
434 views

Duplication with nested null checks

How can I improve this code with nested null check statements? ...
6
votes
2answers
270 views
30
votes
4answers
2k views

Just a lowly counter that turned out to be surprisingly complicated

While writing this review, I saw a need for a Counter object similar to Python's. It seemed like it would be easy to write such a class, but it turned out to be ...
15
votes
2answers
4k views

Using finally with return statement or not

I was wondering if it is the proper way to always put the return statement of a function with a try-catch clause in the finally ...
-2
votes
2answers
143 views

Refactoring the logic of a return value

In my method I have something like this: ...
6
votes
2answers
555 views

How do I better structure Java code to avoid dereferencing null? [closed]

I have the situation where as long as the user gives valid input, the StringBuilder object will not be null. ...
4
votes
3answers
2k views

Return value when the requested variable returns null

I have a method that returns a list from a HTML page: ...
6
votes
2answers
10k views

Extension method to return a default value for any null value

I'm creating an extension method that can be used on any type. The idea is that if this method is called, it checks if value is null. If null, it needs to return a default instance of the specified ...