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Long vs Integer, long vs int, what to use and when?
... you to do some complex operations with integers (such as Integer.parseInt(String) )
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Switch case with fallthrough?
...sh unless you like to define them.
use [23] in case to match 2 or 3
static string cases should be enclosed by '' instead of ""
If enclosed in "", the interpreter (needlessly) tries to expand possible variables in the value before matching.
case "$C" in
'1')
do_this
;;
[23])
do_what_...
How to obtain the start time and end time of a day?
...teTime zdtStop = today.plusDays( 1 ).atStartOfDay( zoneId ) ;
zdtStart.toString() = 2020-01-30T00:00+01:00[Africa/Tunis]
zdtStop.toString() = 2020-01-31T00:00+01:00[Africa/Tunis]
See the same moments in UTC.
Instant start = zdtStart.toInstant() ;
Instant stop = zdtStop.toInstant() ;
start.toS...
Easy interview question got harder: given numbers 1..100, find the missing number(s) given exactly k
...hen
print i
end if
end for
The first loop initialises the k extra entries to the same as the first entry in the array (this is just a convenient value that we know is already present in the array - after this step, any entries that were missing in the initial array of size N-k are sti...
Serving static files with Sinatra
... File.read(File.join('public', 'index.html'))
end
Routes should return a String which become the HTTP response body. File.read opens a file, reads the file, closes the file and returns a String.
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How do I get the localhost name in PowerShell?
...~~~~~~~~~~ + CategoryInfo : ObjectNotFound: (env:COMPUTERNAME:String) [], CommandNotFoundException + FullyQualifiedErrorId : CommandNotFoundException
– mathisfun
Mar 14 '18 at 12:21
...
Mismatched anonymous define() module
... up if
You have an anonymous define ("modules that call define() with no string ID") in its own script tag (I assume actually they mean anywhere in global scope)
You have modules that have conflicting names
You use loader plugins or anonymous modules but don't use require.js's optimizer to bundle ...
Haskell Type vs Data Constructor
...e to you.
Intermission
If you'd want to construct a binary tree to store Strings, you could imagine doing something like
data SBTree = Leaf String
| Branch String SBTree SBTree
What we see here is a type SBTree that contains two data constructors. In other words, there are two funct...
“Items collection must be empty before using ItemsSource.”
...ou caught the error yet? -->
</ItemsControl>
The bug? The extra > after the initial opening <ItemsControl> tag! The < got applied to the built-in Items collection. When the DataContext was later set, instant crashola. So look out for more than just errors surround you...
Which @NotNull Java annotation should I use?
...get({FIELD, METHOD, PARAMETER, LOCAL_VARIABLE})
public @interface NotNull {String value() default "";}
package javax.annotation;
@TypeQualifier
@Retention(RUNTIME)
public @interface Nonnull {
When when() default When.ALWAYS;
static class Checker implements TypeQualifierValidator<Nonnu...