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What are best practices that you use when writing Objective-C and Cocoa? [closed]
...UI if it's on your main thread. If you have a very long query, It's a good idea to store your queries as static objects, and run your SQL on a separate thread. Make sure to wrap anything that modifies the database for query strings in @synchronize() {} blocks. For short queries just leave things on...
Move assignment operator and `if (this != &rhs)`
...r as fast as possible.
Caveat:
Some will argue that swap(x, x) is a good idea, or just a necessary evil. And this, if the swap goes to the default swap, can cause a self-move-assignment.
I disagree that swap(x, x) is ever a good idea. If found in my own code, I will consider it a performance bu...
How to convert Milliseconds to “X mins, x seconds” in Java?
... Actually, doing this for anything longer than an hour is not a good idea since the results could be wrong/unintuitive when daylight savings time (days of 23 or 24 hours) or leap years are involved. If I read "X will happen in 1 year/month", I'd expect it to be the same date and time.
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How do you convert a JavaScript date to UTC?
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I liked your idea and did a method I've been using many times. function convertDateToUTC(date) { return new Date(date.getUTCFullYear(), date.getUTCMonth(), date.getUTCDate(), date.getUTCHours(), date.getUTCMinutes(), date.getUTCSeconds())...
SSH Private Key Permissions using Git GUI or ssh-keygen are too open
...the permissions on the whole directory, which I agree with Splash is a bad idea. If you can remember what the original permissions for the directory are, I would try to set them back to that and then do the following
cd ~/.ssh
chmod 700 id_rsa
inside the .ssh folder. That will set the id_rsa fi...
How to split a long regular expression into multiple lines in JavaScript?
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Very clever. Thanks, this idea helped me a lot. Just as a side note: I encapsulated the whole thing in an function to make it even cleaner: combineRegex = (...regex) => new RegExp(regex.map(r => r.source).join("")) Usage: combineRegex(/regex1/, ...
design a stack such that getMinimum( ) should be O(1)
...raints mentioned (constant time operations) and constant extra space.
The idea is to store the difference between min value and the input number, and update the min value if it is no longer the minimum.
The code is as follows:
public class MinStack {
long min;
Stack<Long> stack;
...
How to use a custom comparison function in Python 3?
...l obviously need to be more complicated. That should give you the general idea though.
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How to use z-index in svg elements?
...5" fill="pink" cx="35" cy="20" r="15"/>
</svg>
The basic idea is:
Use D3 to select the SVG DOM elements.
var circles = d3.selectAll('circle')
Create some array of z-indices with a 1:1 relationship with your SVG elements (that you want to reorder). Z-index arrays used in the exa...
How to get overall CPU usage (e.g. 57%) on Linux [closed]
... or using this for any serious work. This was not tested nor used, it's an idea for people who do not want to install a utility or for something that works in any distribution. Some people think you can "apt-get install" anything.
NOTE: this is not the current CPU usage, but the overall CPU usage ...