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Purge or recreate a Ruby on Rails database
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I know two ways to do this:
This will reset your database and reload your current schema with all:
rake db:reset db:migrate
This will destroy your db and then create it and then migrate your current schema:
rake db:drop db:...
Are HTML Image Maps still used?
...y moved to GitHub. Do we send people back to Google to find where it lives now? Or do we help them go from here? The Australia example is the same example it just lives somewhere different.
– David Newcomb
Apr 5 '16 at 1:26
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plot a circle with pyplot
...e, showing how units matter:
circle1 = plt.Circle((0, 0), 2, color='r')
# now make a circle with no fill, which is good for hi-lighting key results
circle2 = plt.Circle((5, 5), 0.5, color='b', fill=False)
circle3 = plt.Circle((10, 10), 2, color='g', clip_on=False)
ax = plt.gca()
ax.cla() # clear t...
Linux error while loading shared libraries: cannot open shared object file: No such file or director
...other one, you'll have a libfoo.so.1.1, and libfoo.so.1 and libfoo.so will now point to the new one, but any code that requires that exact version can use the libfoo.so.1.0 file. Code that just relies on the version 1 API, but doesn't care if it's 1.0 or 1.1 will specify libfoo.so.1. As orip point...
Merge (with squash) all changes from another branch as a single commit
...ool feature! I love git. While I'll definitely be using this in the future now, I'd still recommend getting to know your way around rebase -i. It's a good skill to have, just in case you really did want to make them more than just one commit.
– Will Buck
Feb 10...
Why are exclamation marks used in Ruby methods?
...downcase, but no change in value of foo.
=> foo #call the variable foo now.
"BEST DAY EVER" #variable is unchanged.
=> foo.downcase! #call destructive version.
=> foo #call the variable foo now.
"best day ever" #variable has been mutated in place.
But if you ever called a method down...
gcc makefile error: “No rule to make target …”
...wered Jun 24 '12 at 17:17
Nick KnowlsonNick Knowlson
6,50944 gold badges4141 silver badges6262 bronze badges
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Would it be beneficial to begin using instancetype instead of id?
...entially no type checking at all. With instancetype, the compiler and IDE know what type of thing is being returned, and can check your code better and autocomplete better.
Only use it where it makes sense of course (i.e. a method that is returning an instance of that class); id is still useful.
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XDocument or XmlDocument
I am now learning XmlDocument but I've just ran into XDocument and when I try to search the difference or benefits of them I can't find something useful, could you please tell me why you would use one over another ?
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Good or bad practice? Initializing objects in getter
...on of this issue is unnecessary as we will see shortly.
In general:
It's now time to look at lazy initialization in general:
Lazy initialization is usually used to delay the construction of objects that take a long time to be constructed or that take a lot of memory once fully constructed.
That is...