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When to use a key/value store such as Redis instead/along side of a SQL database?
...ment you don't need to switch to Redis. You can just use it in order to do new things that were not possible before, or in order to fix old problems.
Use cases the article touches on:
Slow latest items listings in your home page
Leaderboards and related problems
Order by user votes and time
Impl...
Given a DateTime object, how do I get an ISO 8601 date in string format?
...answered Sep 22 '08 at 14:00
WayneWayne
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Sending emails with Javascript
...s particularly long (somewhere over 2000 characters), then it just opens a new email but there's no information in it. I suspect that it'd be to do with the maximum length of the URL being exceeded.
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jQuery ui dialog change title after load-callback
...ethods:
$('.selectorUsedToCreateTheDialog').dialog('option', 'title', 'My New title');
Or directly, hacky though:
$("span.ui-dialog-title").text('My New Title');
For future reference, you can skip google with jQuery. The jQuery API will answer your questions most of the time. In this case, ...
How are virtual functions and vtable implemented?
...rtual int f1() { return -1; }
virtual int f2() { return -2; }
};
A *x = new B;
A *y = new C;
A *z = new C;
Now to pull some shenanigans...
Changing class at runtime:
std::swap(*(void **)x, *(void **)y);
// Now x is a C, and y is a B! Hope they used the same layout of members!
Replacing a me...
Pass a data.frame column name to a function
... y = 5:8)
and we'd like to write a function that creates a new column z that is the sum of columns x and y.
A very common stumbling block here is that a natural (but incorrect) attempt often looks like this:
foo <- function(df,col_name,col1,col2){
df$col_name <- df$col1...
Purge Kafka Topic
...181 --alter --topic <topic name> --config retention.ms=1000
And in newer Kafka releases, you can also do it with kafka-configs --entity-type topics
kafka-configs.sh --zookeeper <zkhost>:2181 --entity-type topics --alter --entity-name <topic name> --add-config retention.ms=1000
...
Setting up two different static directories in node.js Express framework
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Add UIPickerView & a Button in Action sheet - How?
...ent screens where I all users to select from a list of options.
Create a new UITableViewController subclass, SimpleTableViewController.
Create a UITableViewController in your storyboard (embedded in a navigation controller) and set its custom class to SimpleTableViewController.
Give the navigation...
Best way to check if a Data Table has a null value in it
...aRow row in dataTable.Rows)
{
if(row.IsNull("myColumn"))
throw new Exception("Empty value!")
}
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