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How can I combine hashes in Perl?
...es an empty vs non-empty value in the first place? (eg. undef, zero, empty string, false, falsy ...)
See also
PM post on merging hashes
PM Categorical Q&A hash union
Perl Cookbook 5.10. Merging Hashes
websearch://perlfaq "merge two hashes"
websearch://perl merge hash
https://metacpan.org/po...
Sorting object property by values
...and you can choose to sort by whatever object property you want, number or string, if you put the objects in an array. Consider this array:
var arrayOfObjects = [
{
name: 'Diana',
born: 1373925600000, // Mon, Jul 15 2013
num: 4,
sex: 'female'
},
{
...
How to get current CPU and RAM usage in Python?
...e -th').readlines()[-1].split()[1:]. Note that this line returns a list of strings.
– iipr
Aug 1 '19 at 17:58
1
...
SQLite DateTime comparison
...reliable results from the query against a sqlite database using a datetime string as a comparison as so:
12 Answers
...
'is' versus try cast with null check
... below the belt. Take a look at this example:
object o = "test";
if (o is string)
{
var x = (string) o;
}
This translates to the following IL:
IL_0000: nop
IL_0001: ldstr "test"
IL_0006: stloc.0 // o
IL_0007: ldloc.0 // o
IL_0008: isinst System.String
IL_000D...
How to include “zero” / “0” results in COUNT aggregate?
...
You want an outer join for this (and you need to use person as the "driving" table)
SELECT person.person_id, COUNT(appointment.person_id) AS "number_of_appointments"
FROM person
LEFT JOIN appointment ON person.person_id = appointment.person_id
GROUP BY p...
Can I use view pager with views (not with fragments)
...tation is to just return the view as the key as well. FragmentPageAdapter handles all the key-to-view stuff for you and thus just asks you to create a fragment instead.
– themightyjon
Sep 7 '15 at 16:24
...
SQL query to find record with ID not in another table
I have two tables with binding primary key in database and I desire to find a disjoint set between them. For example,
6 Ans...
Check number of arguments passed to a Bash script
...like -eq, -ne, -lt, -le, -gt, or -ge by placing the expression as a single string argument:
A=1
[[ 'A + 1' -eq 2 ]] && echo true ## Prints true.
That should be helpful if you would need to combine it with other features of [[ ]] as well.
Take note that [[ ]] and (( )) are keywords which ha...
How do I display the current value of an Android Preference in the Preference summary?
...public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
Preference pref = findPreference(key);
if (pref instanceof ListPreference) {
ListPreference listPref = (ListPreference) pref;
pref.setSummary(listPref.getEntry());
}
}
This is easi...