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Questions tagged [defensive-programming]

Defensive programming is a form of defensive design intended to ensure the continuing function of a piece of software in spite of unforeseeable usage of said software. Defensive programming techniques are used especially when a piece of software could be misused mischievously or inadvertently to catastrophic effect.

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What happens if I post to a site a million times repeatedly?

I was just trying to post something to a website via my localhost to retrieve some data, and suddenly, this idea came to my mind: What happens if I create a post, put it into a for loop that runs over 1 million times, and send requests to a specific…
Shaokan
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Improving setValueForKeyPath robustness

I have created an extension to NSObject to allow for object properties to be set from data contained in a PLIST or dictionary. I did use setValuesForKeysWithDictionary but this only works for keys not keyPaths. My extension does the same thing,…
Magic Bullet Dave
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Create a matrix MxN with integers inputs with a condition in the digits of the elements (python)

I would like to create a matrix MxN. This matrix gets the inputs from the user. I would like to use defensive programming such that the elements of the matrix have not the digit 2. For example the user should not use integers like…
kcantor
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How can this code be changed to have no vulnerability to arithmetic overflow?

Computer Systems: a Programmer's Perspective says: 1 /* Illustration of code vulnerability similar to that found in 2 * Sun’s XDR library. 3 */ 4 void* copy_elements(void *ele_src[], int ele_cnt, size_t ele_size) { 5 /* 6 * Allocate buffer for…
Tim
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How to prevent outliers to be inserted in database?

I have a MS SQL DB contains set of tables each table represents a collection of variables calculated based on our formulas. All the variables are numeric with predefined percision (we are using numeric data type with n.m as n number of digits for…
Ahmed
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Is this additional check for parsing a string to LocalDate object necessary?

I was writing some tests for some legacy code that validates a user's date of birth. I encounter the following method in the class. My doubt is that whether the if statement in the try block is necessary. From my understanding, if the parse function…
LycheeSojuYYDS
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Kotlin: Condition that double-value is a "normal" number

How can I test if a value of type Double in Kotlin is not Double.POSITIVE_INFINITY, Double.NEGATIVE_INFINITY, Double.NaN or some other special value? I'd like to have something like require(Double.isNormal(x))
Moritz Groß
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Is there a way to enforce that a kotlin function can be run only in the context of another function?

I'm trying to reply this answer Kotlin: Specify input-constraints in interface and my idea was to create a function that implements some validation and allowing the function to be validated to be called only in the context of the validation…
Diego Marin Santos
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How do I switch over an enum class?

Enum classes are supposed to be strong enums in the sense that they don't implicitly convert to and from int. For instance: enum class EC { a, b }; However, when switching over such a "strong enum": int sw(EC ec) { switch (ec) { case EC::a:…
bitmask
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Expose private case class in Scala

I have a situation where a codepath is given some Path's which it uses to query a database. It so happens that sometimes some of these paths need to go through a translation service, to map them to updated Paths before the query. Essentially the…
User
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When checking if an array is empty, should I use array.length <= 0 or array.length === 0?

I am used to check for empty arrays with array.length <= 0. Of course the array should never have a length smaller than 0. This is a habit I developed to make sure my program runs "just in case something weird happens". Is there any reason not to…
eddex
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Initialization in a parameterless constructor should be avoided?

some of my colleagues demand to avoid parameterless constructor and it's initialization completly. Because they tell me that a default initialization of a string property for example quickly hides the ability to find out the source of the error.…
Benjamin Martin
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Is there / should there be a way to track the validity of a raw pointer taken from a smart pointer for debug/QA purposes?

As I understand C++ Core Guidelines by Bjarne Stroustrup & Herb Sutter, it is a good idea to use pointers this way: unique_ptr for the good old clear one ownership shared_ptr for truly shared ownership by design weak_ptr when by design the pointer…
Doron Ben-Ari
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Is it a good practice to add extra checks in disabled GUI options?

I'm referring to the following: void setup_gui() { if (some_condition) some_button.disable(); ... } void some_button_click() { // Is this a good practice? if (some_condition) return; ... } Adding that check…
GameZelda
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add a defensive copy of an object to a hashset

Currently I have this code: public final class Tutor { private String name; private final Set tutees; public Tutor(String name, Student[] students){ this.name = name; tutees = new HashSet(); for (int i = 0;…
pxdr0
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