This tag should be used for questions where you are handling null variables or values.
3
votes
1answer
43 views
Grabbing SQL records: Nullable bool to bool
So I have a method that does a lookup in an existing List<T>, populated elsewhere by grabbing the records from a SQL table holding configuration data for each ...
1
vote
3answers
71 views
Instantiating a property when the required attributes have been set
I have a simple class which holds my product. Someone can add a serial to this product and also a purchase id. On change of the properties, I want to check whether both properties are set, and get the ...
1
vote
1answer
222 views
Validating that only certain values are unset
I am checking data output in some testing code, and only some fields can be None, but I think this can be better:
...
1
vote
1answer
58 views
Rails Grape API Endpoint optional params validation in update
I have the following rails grape api endpoint in the users resource:
...
2
votes
1answer
32 views
Avoiding “warning: Use of uninitialized value” when fetching an integer CGI parameter
I was using this code to fetch a CGI parameter:
$page = int(param('page'));
This sometimes results in:
...
2
votes
2answers
61 views
Custom map on `Array`
I have the following problem:
Given an Array, apply a certain method x to each Array ...
2
votes
4answers
59 views
Throwing exceptions if there is not exactly one box retrieved
(Note: this is originally posted as this SO question )
I'm trying to refactor the error logging and exception throwing into a method.
Original code:
...
1
vote
1answer
105 views
Merging two hashes with the mean values of each key if both hashes exist
There are two methods, hash1 and hash2, that return hashes or nil. The hashes have the same ...
3
votes
3answers
92 views
Sort array of hashes with nil values last
I wrote a method which sorts an array of hashes by given hash keys. The method should put nil values at the end.
...
2
votes
1answer
113 views
Getting JSON data from an HTTP response using conditional binding
I am new to Swift and I am trying to use the optional binding feature in as efficient way as possible but I am a bit confused on how to use it (if I can) in this scenario:
...
0
votes
0answers
47 views
LINQ SQL query to display the status of tracked computers
This is my existing LINQ SQL. At the moment it works, however the using the coalescing operator for null results on the "let" clauses make me feel like I'm violating some sort of unwritten rule. Is ...
0
votes
4answers
63 views
iOS SDK object to represent a place
I am building an iOS SDK to be consumed by apps. I am building an object that represents a physical place. The interface looks like so:
...
3
votes
3answers
107 views
Add the first non-null item from one list to another list
Given these two methods, is it defensible that one is better than the other?
In what terms? Performance? Elegance? Readability?
...
1
vote
1answer
67 views
Constructing query conditions from answers that may be null
I was thinking about this after recently reading about the new Null Conditional Operators in C# 6.0. So here is my code that I am currently working on...
...
-1
votes
3answers
135 views
Nullable boolean value with property
Our Sonar code analysis server tells me
Boolean literals should not be redundant. Redundant Boolean literals
should be removed from expressions to improve readability. Tag:
Clumsy
and ...
2
votes
0answers
43 views
Extracting data for a tag cloud using Lazy.js
I've just started using Lazy.js, which is my first exposure to a "functional style" javascript library. I'm still utterly lost as to which of the hundred different functional javascript libraries to ...
3
votes
2answers
55 views
Conditional logic to determine if popup menu should be visible
I have this small piece of code written in a class. I am looking for a nicer way to write this, preferably avoiding nested if statements like what I currently have:
...
2
votes
0answers
87 views
Improved NullGuard v4 that supports property chains, methods and ignores value types
While working on my simple NullGuard recently I quickly came to the conclusion that this is not enough so I build a more advanced null checking.
Once again I ...
6
votes
1answer
91 views
NullGuard for throwing more informative exceptions
This small utility class is my solution for a more convenient way for checking against null. I also wanted to have more informative NullReferenceExceptions but I ...
2
votes
1answer
78 views
Ignore nil values and unwrap optionals returning the value as the wrapped type
My primary concern is that this has been written as a global function. I think it would be better if this was a function of the SignalProducer class but I am not ...
10
votes
3answers
1k views
“Suspicious comparison of integer references” while checking for a monotonically increasing sequence
I have the following code which iterates on an Integer[] and makes sure that the the values in the array are in ascending order and that there are no neighbouring ...
0
votes
3answers
61 views
Validation null values (preconditions)
I would like to know an alternative, more elegant way to write the following methods.
I am especially not enthusiastic of the nested if statement or ...
1
vote
2answers
82 views
Reducing code complexity for UsergridClient constructor
I'm initializing a class in JavaScript with a bunch of complex property checks. Codacy is showing that this is bad design and recommends reducing cyclomatic complexity.
I'm at a loss for how to ...
5
votes
1answer
349 views
Two overloaded methods to move an e-mail message to another mailbox folder
I have an API for managing an email mailbox. There is a class called Message, and it has two Move overloads:
...
2
votes
1answer
73 views
5
votes
3answers
201 views
Avoid printing attributes of the nil object in Rails
Currently, when I'm wanting to print a value for my class I do the following...
<%= @person.team.name if @person.team.present? %>
This seems really ...
0
votes
0answers
41 views
4
votes
1answer
108 views
Filtering out empty Optionals
I want to convert my list of optional strings to a list of strings by getting rid of the empty Optionals
Is there a shorter version for achieving this than the following code (except statically ...
1
vote
1answer
49 views
Null check when enabling Up navigation in Android
This upvoted SO answer and this upvoted SO answer both check for null in a similar way: they call a function in the if or assert ...
4
votes
2answers
147 views
Treat undef in Perl's <=> operator as +inf instead of 0
I have to sort some numbers with Perl. But some of the numbers are undefined. Perl's compare operator <=> treats undef as -...
5
votes
3answers
152 views
Checking for an undefined nested variable in a JS object
Is there a better or shorthand way to perform a check on whether or not a variable within (possibly several levels of) an object is null or undefined?
What I would currently do to check is:
...
7
votes
1answer
162 views
An attempt at implementing Maybe in C++11
I gave a shot at implementing Maybe for C++ and a slight twist in my implementation is that it uses thread_local static instance ...
6
votes
2answers
151 views
A possibly-terrible alternative to conditionals full of null checks
I am always super annoyed when I have to write a bunch of if statements whenever I have to traverse an object graph of possibly null objects. As there is not yet a <...
3
votes
1answer
421 views
Set a font for a UITextView if the font is nil or not equal to desired font
Main question
I am setting a font for a UITextView that is a subview in a custom view. I only set it if the user didn't specify the font size in the Interface Builder.
I have the following working ...
1
vote
2answers
623 views
Sorting object with null values underscore sortBy
I'm sorting my object by its property ActivityOrder, which will sometimes contain null values if the user has not explicitly ...
7
votes
3answers
674 views
Comparing two objects having two nullable date fields
ExpiryDates has two properties PSL_ExpiryDate and MNL_ExpiryDate of type nullable date. I am ...
-4
votes
1answer
70 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 ...
11
votes
3answers
3k views
Constructing a query string using StringBuilder
I speedily wrote a bunch of crappy checks, to check whether strings are empty, in order to build a query string.
...
-1
votes
3answers
68 views
6
votes
1answer
186 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
74 views
Handle NullValueInNestedPathException
I am looking for a elegant solution to this. I am new to Spring framework. I have a method:
...
2
votes
2answers
8k views
Check for null/empty in dictionary
I am doing the following about 10 times with other strings, so the code is duplicated. How can I refactor this?
queryWhere is a ...
5
votes
1answer
152 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 "...
3
votes
1answer
198 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:
...
4
votes
2answers
131 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
29 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:
...
3
votes
1answer
32 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 ...
3
votes
1answer
48 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 ...
5
votes
2answers
4k 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 ...
2
votes
0answers
53 views
Basic Binary Tree in Go
As an exercise I have written a basic binary tree implementation in Go.
Tree struct:
...
