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What is “callback hell” and how and why does RX solve it?
...know anything about RX in particular, but usually this problem gets solved by adding native support for asynchronous computation in the programming language. The implementations can vary and include: async, generators, coroutines, and callcc.
In Python we can implement that previous loop example w...
You can't specify target table for update in FROM clause
...e started, or the inner query might use data that has already been updated by the query as it's in progress. Neither of these side-effects is necessarily desirable, so the safest bet is to force you to specify what will happen using an extra table.
– siride
Mar...
SQL UPDATE SET one column to be equal to a value in a related table referenced by a different column
...
I got over my problem by eliminating the "FROM" It looked more like this: UPDATE table1 NATURAL JOIN table2 SET table1.col1 = table1.col2 WHERE table2.col3 ="condition"
– 2NinerRomeo
Mar 4 '15 at 20:49
...
How may I reference the script tag that loaded the currently-executing script?
...Does not work with modules <script type="module">
2. Select script by id
Giving the script an id attribute will let you easily select it by id from within using document.getElementById().
<script id="myscript">
var me = document.getElementById('myscript');
</script>
Benefits...
Why does Haskell's “do nothing” function, id, consume tons of memory?
...
@dfeuer Try asking for the type in ghci. You'll see by the speed of the response that it must be doing the appropriate sharing. I suspect this sharing is lost--for obvious reasons--once you translate to some other intermediate representation (e.g. core).
–...
How to search by key=>value in a multidimensional array in PHP
...ults);
}
}
The key there is that search_r takes its fourth parameter by reference rather than by value; the ampersand & is crucial.
FYI: If you have an older version of PHP then you have to specify the pass-by-reference part in the call to search_r rather than in its declaration. That is,...
javascript: Clear all timeouts?
...integer that is greater than zero that will identify the timeout to be set by this call." which leaves room for the handle to be any positive integer including non-consecutive and non-small integers.
– Mike Samuel
Jan 14 '12 at 4:59
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How do I find duplicate values in a table in Oracle?
...
Aggregate the column by COUNT, then use a HAVING clause to find values that appear greater than one time.
SELECT column_name, COUNT(column_name)
FROM table_name
GROUP BY column_name
HAVING COUNT(column_name) > 1;
...
Android custom dropdown/popup menu
...etContentView(R.layout.activity_main);
button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//Creating the instance of PopupMenu
PopupMenu pop...
How do I access my SSH public key?
...sa.pub or cat ~/.ssh/id_dsa.pub
You can list all the public keys you have by doing:
$ ls ~/.ssh/*.pub
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