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Explain which gitignore rule is ignoring my file
...anism does not take effect on paths that are already tracked.
With "--no-index" option, it can be used to diagnose which paths that should have been ignored have been mistakenly added to the index.
See commit 8231fa6 from https://github.com/flashydave:
check-ignore currently shows how .gitig...
Recommended way of making React component/div draggable
...erience would be possibly be janky. If there's
// anything w/ a higher z-index that gets in the way, then you're toast,
// etc.
componentDidUpdate: function (props, state) {
if (this.state.dragging && !state.dragging) {
document.addEventListener('mousemove', this.onMouseMove)...
Fastest way to determine if record exists
... If it is not the PK, I would also suggest making sure there is an index on that column. Otherwise, the query will have to do a table scan instead of a faster table seek.
– CD Jorgensen
Aug 7 '13 at 22:23
...
Database Design for Tagging
...tion well. However, I'm not convinced it's a good idea to implement bitmap indexing "manually", like digiguru suggests: It sounds like a complicated situation whenever new tags are added(?) But some DBMSes (including Oracle) offer bitmap indexes which may somehow be of use, because a built-in indexi...
How do I undo 'git add' before commit?
... commit with
git reset <file>
which will remove it from the current index (the "about to be committed" list) without changing anything else.
You can use
git reset
without any file name to unstage all due changes. This can come in handy when there are too many files to be listed one by one in...
Coding Practices which enable the compiler/optimizer to make a faster program
...e of loops
If a calculation or variable value does not depend on the loop index, move it outside (before) the loop.
I/O in blocks
Read and write data in large chunks (blocks). The bigger the better. For example, reading one octect at a time is less efficient than reading 1024 octets with one re...
Django template how to look up a dictionary value with a variable
... lookup. Example: foo["bar"]
Attribute lookup. Example: foo.bar
List-index lookup. Example: foo[bar]
But you can make a filter which lets you pass in an argument:
https://docs.djangoproject.com/en/dev/howto/custom-template-tags/#writing-custom-template-filters
@register.filter(name='loo...
angular ng-repeat in reverse
..."alert in alerts.slice().reverse()" type="alert.type" close="alerts.splice(index, 1)">{{$index + 1}}: {{alert.msg}}</alert>
Update:
My answer was OK for old version of Angular.
Now, you should be using
ng-repeat="friend in friends | orderBy:'-'"
or
ng-repeat="friend in friends | ord...
What rules does Pandas use to generate a view vs a copy?
...is provided, it will modify in-place; only some operations support this
An indexer that sets, e.g. .loc/.iloc/.iat/.at will set inplace.
An indexer that gets on a single-dtyped object is almost always a view (depending on the memory layout it may not be that's why this is not reliable). This is main...
Regular expression for a hexadecimal number?
...
If you're using Perl or PHP, you can replace
[0-9a-fA-F]
with:
[[:xdigit:]]
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