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Remove empty elements from an array in Javascript
...= 0 || n });
arr // [1, 2, 3, 3, 0, 4, 4, 5, 6]
UPDATE - just another fast, cool way (using ES6):
var arr = [1,2,null, undefined,3,,3,,,0,,,4,,4,,5,,6,,,,],
temp = [];
for(let i of arr)
i && temp.push(i); // copy each non-empty value to the 'temp' array
arr = temp;
arr // [...
In Python, when to use a Dictionary, List or Set?
...ecking for membership of a value in a set (or dict, for keys) is blazingly fast (taking about a constant, short time), while in a list it takes time proportional to the list's length in the average and worst cases. So, if you have hashable items, don't care either way about order or duplicates, and...
What is the C# equivalent to Java's isInstance()?
.... in java, the JVM treats "instanceof" specially, apparently its very very fast, which may explain why its unusually a keyword (there is also an isAssignable method in java).
– Michael Neale
Nov 11 '08 at 23:37
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How to replace master branch in Git, entirely, from another branch? [duplicate]
... work on Heroku: ! [rejected] <new_branch> -> master (non-fast-forward) error: failed to push some refs to '<some_git>.git'
– shaioz
Mar 3 '14 at 15:42
...
How to get mouse position in jQuery without mouse-events?
...ow_popup(str) {
$("#popup_content").html(str);
$("#popup").fadeIn("fast");
$("#popup").css("top", y);
$("#popup").css("left", x);
}
In this way I'll always have the distance from the top saved in y and the distance from the left saved in x.
...
What is the difference between call and apply?
...fferences, but it would be very browser specific. It's likely that call is faster if you don't already have the arguments in an array and apply is faster if you do.
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What is the difference between HTTP_HOST and SERVER_NAME in PHP?
...g my audience to think I've got internet connection and site loaded really fast. You could go the other way, and trick Apache to think it's running locally, with "173.194.41.5 localhost", so you should never trust SERVER_NAME fully unless you are sure your Apache is well configured.
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Array vs. Object efficiency in JavaScript
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The short version: Arrays are mostly faster than objects. But there is no 100% correct solution.
Update 2017 - Test and Results
var a1 = [{id: 29938, name: 'name1'}, {id: 32994, name: 'name1'}];
var a2 = [];
a2[29938] = {id: 29938, name: 'name1'};
a2[32994] =...
Which MIME type to use for a binary file that's specific to my program?
...
mimetype headers are recognised by the browser for the purpose of a (fast) possible identifying a handler to use the downloaded file as target, for example, PDF would be downloaded and your Adobe Reader program would be executed with the path of the PDF file as an argument,
If your needs are ...
How do I replace a character at a particular index in JavaScript?
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In my tests this method was quickest by far... and even faster if you don't need to verify that [index] isn't bigger than the string length. Modified: function setCharAt(str,idx,newChr){ return str.substring(0,idx)+newChr+str.substring(idx+1);}
– ashleedawg
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