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Why does Ruby have both private and protected methods?
...ods from your parent class (and some class even list this as part of their API).
– Franklin Yu
Jun 20 '17 at 14:34
1
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Convert PEM to PPK file format
...s not stored in vCloud Express.
The “Default” checkbox is used for the API.
Deploy server and select key
Connect
SSH (Mac/Linux)
Copy .PEM file to the machine from which you are going to connect.
Make sure permissions on .PEM file are appropriate (chmod 600 file.pem)
Connect with ssh comma...
When would you use a WeakHashMap or a WeakReference?
... Thus, weakreference only makes sense in Java because of Java's quirky API where some classes cannot be extended.
– Pacerier
Sep 18 '17 at 4:53
add a comment
...
Compare two objects in Java with possible null values
...
For those on android, who can't use API 19's Objects.equals(str1, str2), there is this:
android.text.TextUtils.equals(str1, str2);
It is null safe. It rarely has to use the more expensive string.equals() method because identical strings on android almost al...
Check if an apt-get package is installed and then install it if it's not on Linux
...ls it if not can be seen at: How to install a package using the python-apt API
Here is a copy for reference:
#!/usr/bin/env python
# aptinstall.py
import apt
import sys
pkg_name = "libjs-yui-doc"
cache = apt.cache.Cache()
cache.update()
cache.open()
pkg = cache[pkg_name]
if pkg.is_installed:
...
Why 0 is true but false is 1 in the shell?
...nvestigate the particular error for more details if you want to. A lot of APIs and frameworks have a similar convention - functions that succeed return 0 and and those that fail give back an error code describing the particular failure case.
...
Perform .join on value in array of objects
...oach, I didn't realise you could do this in JS. The data is coming from an API though, so it's probably not suitable for my use case, but it's definitely food for thought.
– jackweirdy
May 17 '13 at 11:19
...
How do you read from stdin?
...e in fileinput.input():
pass
But, since sys.stdin implements the file API, including the iterator protocol, that's just the same as this:
import sys
for line in sys.stdin:
pass
Another answer does suggest this. Just remember that if you do it in an interpreter, you'll need to do Ctrl-d if...
jQuery vs document.querySelectorAll
...ross-browsers, flawlessly, offering all that jQuery can offer (plugins and APIs).
Yes, if you think you can rely on simple class and id selectors, jQuery is too much for you, and you'd be paying an exaggerated pay-off. But if you don't, and want to take advantage of all jQuery goodness, then use it...
jQuery Selector: Id Ends With?
... $("[id$='txtTitle']").val("zz");
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input id="ctl_blabla_txtTitle" type="text" />
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