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What is the fastest or most elegant way to compute a set difference using Javascript arrays?
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if don't know if this is most effective, but perhaps the shortest
A = [1, 2, 3, 4];
B = [1, 3, 4, 7];
diff = A.filter(function(x) { return B.indexOf(x) < 0 })
console.log(diff);
Updated to ES6:
A = [1, 2, 3, 4];
B = [1, 3, 4, ...
Automapper: Update property values without creating a new object
...= new dest
{
//initialize properties
}
_mapper.Map(src, dest);
dest will now be updated with all the property values from src that it shared. The values of its unique properties will remain the same.
Here's the relevant source code
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Why are there no ++ and -- operators in Python?
...++" as "x += 1, evaluating to the previous binding of x".
If you want to know the original reason, you'll have to either wade through old Python mailing lists or ask somebody who was there (eg. Guido), but it's easy enough to justify after the fact:
Simple increment and decrement aren't needed as ...
How to install latest (untagged) state of a repo using bower?
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By now, you can also just use <git-url>#<branch-name> instead of adding a SHA-ID. So you can also use <git-url>#master to track the master branch.
– MKroehnert
Nov 2 '13 a...
How do I turn off “Automatically Switch to Debug Perspective” mode in eclipse?
...here a way to turn off this mode? I must have clicked it by accident, and now it's getting really annoying.
4 Answers
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What's the best way to do a backwards loop in C/C#/C++?
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Instead of doing
(sizeof a / sizeof *a)
Change your code so that it now does
(sizeof array_size(a))
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Why is my Android emulator keyboard in Chinese character mode?
.....then click on the address bar of the browser..
Magic....your language is now changed to English..
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What is Turing Complete?
...lar to those machines (although virtual). They take programs and run them. Now, a programing language is called "Turing complete", if that it can run any program (irrespective of the language) that a Turing machine can run given enough time and memory.
For example: Let's say there is a program tha...
How to get english language word database? [closed]
...y downloaded it, but it was there ready when I started coding. So I don't know what files will be there in which download. I just know that you can download in different formats. If you can tell me in which format you want, I may be able to help.
– user266803
F...
Reverting a single file to a previous version in git [duplicate]
...work tree, along with some metadata (e.g. commit message). So, we have to know which commit has the version of the file we want. Once we know that, we'll need to make a new commit reverting the file to that state. (We can't just muck around with history, because we've already pushed this content, an...