This question’s answers are a community effort. Edit existing answers to improve this post. It is not currently accepting new answers or interactions. My Google-fu has failed me. In Python, are the following two tests for equality equivalent? n = 5 # Test one. if n == 5: print ‘Yay!’ # Test two. if n … Read more
I am trying to run some unit tests in a C# Windows Forms application (Visual Studio 2005), and I get the following error: System.IO.FileLoadException: Could not load file or assembly ‘Utility, Version=1.2.0.200, Culture=neutral, PublicKeyToken=764d581291d764f7’ or one of its dependencies. The located assembly’s manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)** at … Read more
What’s the difference between java.lang.ref.WeakReference and java.lang.ref.SoftReference ? 12 s 12 From Understanding Weak References, by Ethan Nicholas: Weak references A weak reference, simply put, is a reference that isn’t strong enough to force an object to remain in memory. Weak references allow you to leverage the garbage collector’s ability to determine reachability for you, … Read more
I’m creating a function where I need to pass an object so that it can be modified by the function. What is the difference between: public void myFunction(ref MyClass someClass) and public void myFunction(out MyClass someClass) Which should I use and why? 27 s 27 ref tells the compiler that the object is initialized before … Read more
I set dict2 = dict1. When I edit dict2, the original dict1 also changes. Why? >>> dict1 = {“key1”: “value1”, “key2”: “value2”} >>> dict2 = dict1 >>> dict2[“key2”] = “WHY?!” >>> dict1 {‘key2’: ‘WHY?!’, ‘key1’: ‘value1’} 2 21
I know references are syntactic sugar, so code is easier to read and write. But what is the difference between a pointer variable and a reference variable? 4 42
static means that the variable or method marked as such is available at the class level. In other words, you don’t need to create an instance of the class to access it. public class Foo { public static void doStuff(){ // does stuff } } So, instead of creating an instance of Foo and then … Read more
While using new_list = my_list, any modifications to new_list changes my_list every time. Why is this, and how can I clone or copy the list to prevent it? 2 21
Are parameters are passed by reference or value? How do I pass by reference so that the code below outputs ‘Changed’ instead of ‘Original’? class PassByReference: def __init__(self): self.variable=”Original” self.change(self.variable) print(self.variable) def change(self, var): var=”Changed” 3 36 Arguments are passed by assignment. The rationale behind this is twofold: the parameter passed in is actually a … Read more
