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Does Ruby have a string.startswith(“abc”) built in method?
... length of the given string—whereas index will have to search the entire base string. In a failure case, starts_with? will take one access (per string) and comparison, whereas index will walk almost the full length of the base string.
– OldPeculier
Jul 28 '14...
error: ‘std::ios_base::ios_base(const std::ios_base&)’ is private ...
error: ‘std::ios_base::ios_base(const std::ios_base&)’ is private ios_base(const ios_base&); synthesized method ‘std::basic_ostream::basic_ostream(const std::basic_ostream&)’ first required here这个错误的原因大概是std::ios_base类的拷贝构造函数是私有的，从retu...
Is there a typical state machine implementation pattern?
...e in to another state.
Finally, don't start the design of a state machine based on "functional" boundaries, use sub-functions for that. Instead divide the states based on when you will have to wait for something to happen before you can continue. This will help minimize the number of times you ha...
What is the difference between a map and a dictionary?
...e to query "is C present?".
The Computing Science notion of map though is based on the mathematical linguistic term mapping, which the Oxford Dictionary defines as:
mapping An operation that associates each element of a given set (the domain) with one or more elements of a second set (the range).
...
Software Design vs. Software Architecture [closed]
...e designing, implementing, maintaining the backend servers (probably cloud-based), and front-end design (Web or mobile) all by themselves. I think they're called full stack developers. Right?
– Maziyar
Aug 1 '14 at 7:07
...
Entity framework linq query Include() multiple children entities
...
Years later, I would not recommend the string-based includes, because they aren't runtime safe. If the navigation property name ever changes or is misspelled, it will break. Strongly suggest using the typed include instead.
– Jeff Putz
...
How to log a method's execution time exactly in milliseconds?
...
Anything based on NSDate is not safe for measuring passed time because the time can jump, even backwards. A much safer way is to use mach_absolute_time, as shown in many of the other answers here. This one should be downvoted for bein...
Why are primes important in cryptography?
...hat it uses qbits, each qbit can have 3 values, thus the new technology is base 3 not base 2. a 64 qbits CPU would have 3^64 combinations in a word. Don't know how it impacts performance.
– juanmf
Jun 27 '17 at 5:07
...
Passing a dictionary to a function as keyword parameters
... requested in comments, a solution to Number 3 is to filter the dictionary based on the keyword arguments available in the function:
In[11]: import inspect
In[12]: mydict = {'a': 100, 'b': 200, 'c': 300}
In[13]: filtered_mydict = {k: v for k, v in mydict.items() if k in [p.name for p in inspect.sig...
Providing white space in a Swing GUI
...cationRelativeTo(null);
}
private void initUI() {
JPanel base = new JPanel(new MigLayout("flowy, ins 30, gap 15"));
setContentPane(base);
JPanel pnl1 = new JPanel();
pnl1.setBorder(
BorderFactory.createTitledBorder("Grid gaps")
);
...