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Is it safe to get values from a java.util.HashMap from multiple threads (no modification)?
...a map will be constructed, and once it is initialized, it will never be modified again. It will however, be accessed (via get(key) only) from multiple threads. Is it safe to use a java.util.HashMap in this way?
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How default .equals and .hashCode will work for my classes?
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Yes, the default implementation is Object's (generally speaking; if you inherit from a class that redefined equals and/or hashCode, then you'll use that implementation instead).
From the documentation:
equals
The equals method for class Object implements the most discriminating possi...
In Clojure, when should I use a vector over a list, and the other way around?
...de" "generating back-to-front" -> means precisely?? I am really having difficulty with this question because in my book laziness + declarative style = far better performance, and yet vectors are suggested everywhere in Clojure which leaves me totally confused.
– Jimmy Hoffa
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How to get a number of random elements from an array?
...ew Array(n),
len = arr.length,
taken = new Array(len);
if (n > len)
throw new RangeError("getRandom: more elements taken than available");
while (n--) {
var x = Math.floor(Math.random() * len);
result[n] = arr[x in taken ? taken[x] : x];
tak...
Regular expression to return text between parenthesis
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If your problem is really just this simple, you don't need regex:
s[s.find("(")+1:s.find(")")]
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improve this answe...
What's the best way to bundle static resources in a Go program? [closed]
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Embedding Text Files
If we're talking about text files, they can easily be embedded in the source code itself. Just use the back quotes to declare the string literal like this:
const html = `
<html>
<body>Example embedded HTML conten...
When to use a linked list over an array/array list?
...oss a scenario in which the array list couldn't be used just as easily as, if not easier than, the linked list. I was hoping someone could give me some examples of when the linked list is notably better.
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How to prove that a problem is NP complete?
...e information C, you can create a polynomial time algorithm V that will verify for every possible input X whether X is in your domain or not.
Example
Prove that the problem of vertex covers (that is, for some graph G, does it have a vertex cover set of size k such that every edge in G has at least o...
Diff files present in two different directories
... need to compare all the files present in both the directories using the diff command. Is there a simple command line option to do it, or do I have to write a shell script to get the file listing and then iterate through them?
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Using Git, show all commits that are in one branch, but not the other(s)
... to my current branch which have not been applied to any other branch [or, if this is not possible without some scripting, how does one see all commits in one branch which have not been applied to another given branch?].
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