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How does a Java HashMap handle different objects with the same hash code?
...f HashMap's mechanism, for Java 8 version, (it might be slightly different from Java 6).
Data structures
Hash table
Hash value is calculated via hash() on key, and it decide which bucket of the hashtable to use for a given key.
Linked list (singly)
When count of elements in a bucket is small, a...
Is there a setting on Google Analytics to suppress use of cookies for users who have not yet given c
... Cookie Laws'), web sites that target EU users have to gain opt-in consent from users before they set a cookie.
11 Answers
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String concatenation: concat() vs “+” operator
...to change when the next update is released, or if you use a different JVM. From @lukaseder, a list of HotSpot JVM intrinsics.
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Do python projects need a MANIFEST.in, and what should be in it?
...l base for setuptools as setuptools shall take care of hiding these things from you.
EDIT: Last few projects I use pbr for building distribution packages with three line setup.py and rest being in setup.cfg and requirements.txt. No need to care about MANIFEST.in and other strange stuff. Even though...
Is it good practice to NULL a pointer after deleting it?
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Setting a pointer to 0 (which is "null" in standard C++, the NULL define from C is somewhat different) avoids crashes on double deletes.
Consider the following:
Foo* foo = 0; // Sets the pointer to 0 (C++ NULL)
delete foo; // Won't do anything
Whereas:
Foo* foo = new Foo();
delete foo; // Del...
Forced naming of parameters in Python
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In Python 3 - Yes, you can specify * in the argument list.
From docs:
Parameters after “*” or “*identifier” are keyword-only parameters and
may only be passed used keyword arguments.
>>> def foo(pos, *, forcenamed):
... print(pos, forcenamed)
...
>>&...
Global and local variables in R
...ction() {
bar <<- 1
}
foo()
bar
In this case bar is accessible from outside the function.
However, unlike C, C++ or many other languages, brackets do not determine the scope of variables. For instance, in the following code snippet:
if (x > 10) {
y <- 0
}
else {
y <- 1...
When to use an interface instead of an abstract class and vice versa?
...think this was the "lightbulb" moment for me - think about interfaces less from the author's perpective and more from that of any coder coming later in the chain who is adding implementation to a project, or extending an API.
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What's the difference between findAndModify and update in MongoDB?
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From the MongoDB docs (emphasis added):
By default, both operations modify a single document. However, the update() method with its multi option can modify more than one document.
If multiple documents match the upda...
Can a decorator of an instance method access the class?
... the following. Basically I need to access the class of an instance method from a decorator used upon the instance method in its definition.
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