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What does “|=” mean? (pipe equal operator)
...1<<2 or 100 in binary
So you can use bit-wise OR to add flags
int myFlags = DEFAULT_SOUND | DEFAULT_VIBRATE; // same as 001 | 010, producing 011
so
myFlags |= DEFAULT_LIGHTS;
simply means we add a flag.
And symmetrically, we test a flag is set using & :
boolean hasVibrate = (DEFA...
Is there a better way to do optional function parameters in JavaScript? [duplicate]
...can declare default argument values in the function declaration:
function myFunc(requiredArg, optionalArg = 'defaultValue') {
// do stuff
}
More about them in this article on MDN.
This is currently only supported by Firefox, but as the standard has been completed, expect support to improve r...
puts vs logger in rails rake tasks
... a real problem... I am running like 8 consoles tracing what's going on in my app, just switch between tabs when you're working on a specific part of the system no big deal imho
– marcgg
Feb 11 '10 at 17:19
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Python memoising/deferred lookup property decorator
...
I wrote this one for myself... To be used for true one-time calculated lazy properties. I like it because it avoids sticking extra attributes on objects, and once activated does not waste time checking for attribute presence, etc.:
import funct...
Can't find the 'libpq-fe.h header when trying to install pg gem
...
I could solve this in another way. I didn't find the library on my system. Thus I installed it using an app from PostgreSQL main website. In my case (OS X) I found the file under /Library/PostgreSQL/9.1/include/ once the installation was over. You may also have the file somewhere else de...
What is “assert” in JavaScript?
...
something that I've added to my code inside the if(!condition) is setting var throwError=true; then debugger; then wrap the throw section in an if(throwError). That way, if I have the debugger open, it'll break, and if I so desire I can set throwError to...
Python unit test with base and sub class
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This is my favorite. It is the least hacky means and doesn't interfere with overriding methods, doesn't alter the MRO and allows me to define setUp, setUpClass etc. in the base class.
– Hannes
M...
Why is iterating through a large Django QuerySet consuming massive amounts of memory?
...en you have everything in memory, and the results come spilling out.
From my reading of the docs, iterator() does nothing more than bypass QuerySet's internal caching mechanisms. I think it might make sense for it to a do a one-by-one thing, but that would conversely require ten-million individual...
How to check that a string is a palindrome using regular expressions?
...t a historical heritage. See stackoverflow.com/questions/233243#235199 and my answer.
– jfs
Nov 3 '08 at 21:57
2
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How to read a file into a variable in shell?
...and, where there are 5511 lines? The pitfalls come from the $() expansion, my example shows that $() expansion works with \'".
– Ciro Santilli 郝海东冠状病六四事件法轮功
Oct 13 '14 at 9:21
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