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What is the difference between null and undefined in JavaScript?
...g. that is to say they will throw an exception. With WSH you will see the dreaded "'varname' is null or not an object" and that's if you're lucky (but that's a topic for another article).
You can explicitely set a variable to be undefined, but I highly advise against it. I recommend only setting va...
sql primary key and index
...ten do I also need to index it? Or does it being a primary key mean it's already indexed?
11 Answers
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How to write a CSS hack for IE 11? [duplicate]
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In the light of the evolving thread, I have updated the below:
IE 11 (and above..)
_:-ms-fullscreen, :root .foo { property:value; }
IE 10 and above
_:-ms-lang(x), .foo { property:value; }
or
@media all and (-ms-high-contrast: none), (-ms-high-contr...
jQuery - checkbox enable/disable
...ithout introducing the ID and classes but it's slower and (imho) harder to read.
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Remove specific commit
...ast-forward allowed", which happens when you want to remove a commit you already pushed), you can use git push -f to force push the changes.
Note2: if working on a branch and you need to force push, you should absolutely avoid git push --force because this may overwrite other branches (if you have ...
Change SVN repository URL
... a lot of things can get broken (so either backup your working copy, or be ready to re-checkout the whole repo if something goes wrong).
The repo address and its UUID are saved in the .svn/wc.db SQLite database file in your working copy. Just open the database (e.g. in SQLite Browser), browse table...
Which is fastest? SELECT SQL_CALC_FOUND_ROWS FROM `table`, or SELECT COUNT(*)
...LOCK TABLES. Third option and (best IMHO) is to rethink pagination. Please read: mariadb.com/kb/en/library/pagination-optimization
– Madhur Bhaiya
Oct 27 '19 at 3:05
add a com...
What is the difference between require_relative and require in Ruby?
...ire '/a.rb' and require_relative '/a.rb' both require the absolute path.
Reading the source
When the docs are not clear, I recommend that you take a look at the sources (toggle source in the docs). In some cases, it helps to understand what is going on.
require:
VALUE rb_f_require(VALUE obj, VA...
How to access accelerometer/gyroscope data from Javascript?
...);
}, true);
}
The constant factors 2 and 50 are used to "align" the readings from the two latter events with those from the first, but these are by no means precise representations. For this simple "toy" project it works just fine, but if you need to use the data for something slightly more ...
Adding iOS UITableView HeaderView (not section header)
...ble header NOT a section header. The two things are very different. Please read the question.
– Charles Robertson
Nov 18 '16 at 0:03
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