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How to implement Enums in Ruby?
...e when you want to enhance readability without littering code with literal strings.
postal_code[:minnesota] = "MN"
postal_code[:new_york] = "NY"
Constants are appropriate when you have an underlying value that is important. Just declare a module to hold your constants and then declare the constan...
How to write an async method with out parameter?
...orad I especially like this: private async Task<(bool success, Job job, string message)> TryGetJobAsync(...)
– J. Andrew Laughlin
Oct 26 '18 at 15:26
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What is the difference between `raise “foo”` and `raise Exception.new(“foo”)`?
...
From the offical documentation:
raise
raise( string )
raise( exception [, string [, array ] ] )
With no arguments, raises the exception in $! or raises a RuntimeError if $! is nil. With a single String argument, it raises a RuntimeError with the string as a message. O...
Adding a directory to $LOAD_PATH (Ruby)
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Also, it's a lot harder to Google for strings like "$:" that contain only symbols.
– DSimon
Apr 19 '12 at 3:39
add a comment
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Hyphen, underscore, or camelCase as word delimiter in URIs?
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any convention for the queryString, for instance ?event_id=1 or ?eventId=1???
– user2727195
Oct 7 '15 at 23:21
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What is the purpose of using -pedantic in GCC/G++ compiler?
...f more extensions and generates more warnings. For example, if you have a string literal longer than 509 characters, then -pedantic warns about that because it exceeds the minimum limit required by the C89 standard. That is, every C89 compiler must accept strings of length 509; they are permitted ...
Convert text into number in MySQL query
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This should work:
SELECT field,CONVERT(SUBSTRING_INDEX(field,'-',-1),UNSIGNED INTEGER) AS num
FROM table
ORDER BY num;
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Using the “animated circle” in an ImageView while loading stuff
...rterFactory;
public class MainActivity extends AppCompatActivity {
final String debugLogHeader = "Linklet Debug Message";
Call<Links> call;
List<Link> arraylistLink;
ListView linksListV;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceSta...
How to create a trie in Python
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Static memory-efficient Trie structures for Python (2.x and 3.x).
String data in a MARISA-trie may take up to 50x-100x less memory than
in a standard Python dict; the raw lookup speed is comparable; trie
also provides fast advanced methods like prefix search.
Based on marisa-trie C...
Query grants for a table in postgres
... really want one line per user, you can group by grantee (require PG9+ for string_agg)
SELECT grantee, string_agg(privilege_type, ', ') AS privileges
FROM information_schema.role_table_grants
WHERE table_name='mytable'
GROUP BY grantee;
This should output something like :
grantee | privil...