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What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?
... prevent N+1 selects.
Reference: Java Persistence with Hibernate, chapter 13.
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How to use jQuery in chrome extension?
...e this :
"background":
{
"scripts": ["thirdParty/jquery-2.0.3.js", "background.js"]
}
If you need jquery in a content_scripts, you have to add it in the manifest too:
"content_scripts":
[
{
"matches":["http://website*"],
"js":["thirdParty/jq...
Programmatically Lighten or Darken a hex color (or rgb, and blend colors)
...n or darken a hex color by a specific amount. Just pass in a string like "3F6D2A" for the color ( col ) and a base10 integer ( amt ) for the amount to lighten or darken. To darken, pass in a negative number (i.e. -20 ).
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How to catch integer(0)?
...
answered Jun 23 '11 at 8:30
Gavin SimpsonGavin Simpson
152k2424 gold badges354354 silver badges415415 bronze badges
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Simple C example of doing an HTTP POST and consuming the response
...received, total;
char message[1024],response[4096];
if (argc < 3) { puts("Parameters: <apikey> <command>"); exit(0); }
/* fill in the parameters */
sprintf(message,message_fmt,argv[1],argv[2]);
printf("Request:\n%s\n",message);
/* create the socket */
so...
JavaScript “new Array(n)” and “Array.prototype.map” weirdness
I've observed this in Firefox-3.5.7/Firebug-1.5.3 and Firefox-3.6.16/Firebug-1.6.2
14 Answers
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How to write the Fibonacci Sequence?
... two numbers of the
sequence itself, yielding the sequence
0, 1, 1, 2, 3, 5, 8, etc.
If your language supports iterators you may do something like:
def F():
a,b = 0,1
while True:
yield a
a, b = b, a + b
Display startNumber to endNumber only from Fib sequence.
Once y...
How to host a Node.Js application in shared hosting [closed]
...xtract the latest node
exec('curl http://nodejs.org/dist/latest/node-v0.10.33-linux-x86.tar.gz | tar xz');
//Rename the folder for simplicity
exec('mv node-v0.10.33-linux-x86 node');
2) The same way install your node app, e.g. jt-js-sample, using npm:
<?php
exec('node/bin/npm install jt-js-sam...
Listing all permutations of a string/integer
...
I found the pseudocode on http://www.programmersheaven.com/mb/Algorithms/369713/369713/permutation-algorithm-help/:
makePermutations(permutation) {
if (length permutation < required length) {
for (i = min digit to max digit) {
if (i not in permutation) {
makePermutations(per...
Using a dictionary to count the items in a list [duplicate]
...
in 2.7 and 3.1 there is special Counter dict for this purpose.
>>> from collections import Counter
>>> Counter(['apple','red','apple','red','red','pear'])
Counter({'red': 3, 'apple': 2, 'pear': 1})
...