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String length in bytes in JavaScript
...r for a modern approach.)
For historical reference or where TextEncoder APIs are still unavailable.
If you know the character encoding, you can calculate it yourself though.
encodeURIComponent assumes UTF-8 as the character encoding, so if you need that encoding, you can do,
function lengthInU...
Android Spinner : Avoid onItemSelected calls during initialization
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Beginning with API level 3 you can use onUserInteraction() on an Activity with a boolean to determine if the user is interacting with the device.
http://developer.android.com/reference/android/app/Activity.html#onUserInteraction()
@Overri...
PHP how to get local IP of system
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This is the solution that worked for me and that avoids calling shells, operating system commands and all sorts of stuff that can open security holes or raise odd issues later.
– Dario Fumagalli
Jul 17 '14 at 10:59
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Difference between . and : in Lua
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To be completely precise, obj:method(1, 2, 3) is the same as
do
local _obj = obj
_obj.method(_obj, 1, 2, 3)
end
Why the local variable? Because, as many have pointed out, obj:method() only indexes _ENV once to get obj. This normally just important when considering speed, but consider this s...
mongodb: insert if not exists
... has built-in support for this. Pass an extra parameter to your update() call: {upsert:true}. For example:
key = {'key':'value'}
data = {'key2':'value2', 'key3':'value3'};
coll.update(key, data, upsert=True); #In python upsert must be passed as a keyword argument
This replaces your if-find-els...
Proper usage of Optional.ifPresent()
...r> user = ...
user.ifPresent(this::doSomethingWithUser);
This is basically the same thing as
Optional<User> user = ...
user.ifPresent(new Consumer<User>() {
@Override
public void accept(User theUser) {
doSomethingWithUser(theUser);
}
});
The idea is that the d...
Run a Python script from another Python script, passing in arguments [duplicate]
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I believe it's generally preferable to use subprocess.Popen over os.system: docs.python.org/library/subprocess.html#replacing-os-system.
– Katriel
Sep 23 '10 at 20:15
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cartesian product in pandas
...n unused column name, then add dummy columns with that name, merge, and finally drop the column on the result? Creating, as opposed to reading, data with pandas is just a pain
– Bananach
Oct 10 '19 at 7:31
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How do you sort a list in Jinja2?
...ilter allows you to specify an attribute to sort by:
{% for movie in movie_list|sort(attribute='rating') %}
See http://jinja.pocoo.org/docs/templates/#sort
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How do I load my script into the node.js REPL?
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What if I want to drop into the repl inside of an async callback?
– Chet
Aug 20 '17 at 20:07
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