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Why does Math.round(0.49999999999999994) return 1?
...s (CPU, 32- or 64-bit mode).
And, when using round or inverting matrices, etc., these bits can make a huge difference.
x64 output:
10.5 rounded is 11
10.499999999999998 rounded is 10
9.5 rounded is 10
9.499999999999998 rounded is 9
8.5 rounded is 9
8.499999999999998 rounded is 8
7.5 rounded is 8
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Reference — What does this symbol mean in PHP?
... @Lotus - I consider it a fun fact. If you're a beginner to PHP, or C++, etc, it seems pretty wacky that ++i and i++ are different enough to work at different speeds. I found it fascinating.
– Peter Ajtai
Dec 9 '10 at 10:47
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How to align checkboxes and their labels consistently cross-browsers
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Sometimes vertical-align needs two inline (span, label, input, etc...) elements next to each other to work properly. The following checkboxes are properly vertically centered in IE, Safari, FF, and Chrome, even if the text size is very small or large.
They all float next to each other o...
Pandoc markdown page break
...tput if the target format can contain raw TeX (i.e., LaTeX, Markdown, Org, etc.).
We can use a simple Lua filter to translate this when targeting a different format. The following works for docx, LaTeX, epub, and light-weight markup.
--- Return a block element causing a page break in the given for...
Send attachments with PHP Mail()?
...using it requires to needlessly import another thing to trust (i.e no bugs/etc in the PHPMailer). To not blindly trust one would require one to look at the at least 3155 lines sloc (115.456 kb) of code. Given the alternative purely mail() using answers this seems like a worse tradeoff. The alternati...
Difference between java.util.Random and java.security.SecureRandom
...dom takes Random Data from your os(they can be interval between keystrokes etc - most os collect these data store them in files - /dev/random and /dev/urandom in case of linux/solaris) and uses that as the seed. So if the small token size is okay(in case of Random), you can continue using your code...
Insert a commit before the root commit in Git?
...ids touching the working copy or the index or which branch is checked out, etc.
Create a tree object for an empty directory:
tree=`git hash-object -wt tree --stdin < /dev/null`
Wrap a commit around it:
commit=`git commit-tree -m 'root commit' $tree`
Create a reference to it:
git branch new...
Django - what is the difference between render(), render_to_response() and direct_to_template()?
...mplateView), they used to be implemented as functions (direct_to_template, etc). Views implemented as functions, my personal preference, are still supported and that won't change.
– Nick Zalutskiy
Mar 27 '13 at 1:35
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What is a serialVersionUID and why should I use it?
...hods, readResolve/writeReplace() methods, serializableFields declarations, etc, to make sure that the stream remains compatible. Changing the actual serialVersionUID is a last resort, a counsel of despair.
– Marquis of Lorne
Dec 12 '12 at 0:59
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Are there legitimate uses for JavaScript's “with” statement?
...ight you can say var bc2 = context.bezierCurveTo; and then just go bc2(x,x,etc); each time you want to call it. That is quite fast and even less verbose, while with is super slow.
– Jimbo Jonny
Oct 26 '15 at 17:32
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