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What is the difference between == and equals() in Java?
...dback I received felt pretty much "you are doing the totally wrong thing". Now I am simply wondering how you look at this? Do you have "generic" messages in your quiver, or do you write solely specific comments in such cases?
– GhostCat
Aug 20 '18 at 18:05
...
How do you performance test JavaScript code?
...and easy to use, as are console.time(), console.profile(), and performance.now(). Chrome also gives you a timeline view which can show you what is killing your frame rate, where the user might be waiting, etc.
Finding documentation for all these tools is really easy, you don't need an SO answer for...
How to undo “git commit --amend” done instead of “git commit”
...happens on top of a different commit from where the current branch head is now.
# Move the current head so that it's pointing at the old commit
# Leave the index intact for redoing the commit.
# HEAD@{1} gives you "the commit that HEAD pointed at before
# it was moved to where it currently point...
Jdbctemplate query for string: EmptyResultDataAccessException: Incorrect result size: expected 1, ac
... than one row that will result in IncorrectResultSizeDataAccessException . Now the correct way is not to catch this exception or EmptyResultDataAccessException, but make sure the query you are using should return only one row. If at all it is not possible then use query method instead.
List<Str...
How can I check for “undefined” in JavaScript? [duplicate]
...n window; // true
"theFoo" in window; // false
If you are interested in knowing whether the variable hasn't been declared or has the value undefined, then use the typeof operator, which is guaranteed to return a string:
if (typeof myVar !== 'undefined')
Direct comparisons against undefined are ...
How to use Elasticsearch with MongoDB?
...(var i = 1; i <= 25; i++) db.YOUR_COLLECTION_NAME.insert( { x : i } )
Now to Convert the standalone MongoDB into a Replica Set.
First Shutdown the process.
mongo YOUR_DATABASE_NAME
use admin
db.shutdownServer()
Now we're running MongoDB as a service, so we don't pass in the "--replSet rs0" ...
JSON datetime between Python and JavaScript
...ime.datetime, datetime.date))
else None
)
json.dumps(datetime.datetime.now(), default=date_handler)
'"2010-04-20T20:08:21.634121"'
Which is ISO 8601 format.
A more comprehensive default handler function:
def handler(obj):
if hasattr(obj, 'isoformat'):
return obj.isoformat()
...
Code for a simple JavaScript countdown timer?
... Date().getTime();
var interval = setInterval(function() {
var now = time-(new Date().getTime()-start);
if( now <= 0) {
clearInterval(interval);
complete();
}
else update(Math.floor(now/1000));
},100); // the smaller this number, the...
What breaking changes are introduced in C++11?
I know that at least one of the changes in C++11 that will cause some old code to stop compiling: the introduction of explicit operator bool() in the standard library, replacing old instances of operator void*() . Granted, the code that this will break is probably code that should not have been v...
How does JavaScript .prototype work?
... really got my head around this prototype-based programming, does any one know how this works?
26 Answers
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