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Passing a 2D array to a C++ function
... TwoD>
void myFunction(TwoD& myArray){
myArray[x][y] = 5;
etc...
}
// call with
double anArray[10][10];
myFunction(anArray);
It works with any 2D "array-like" datastructure, such as std::vector<std::vector<T>>, or a user defined type to maximize code reuse.
...
Getting a list of associative array keys
...ck note. Be wary of using for..in if you use a library (jQuery, Prototype, etc.), as most of them add methods to created Objects (including dictionaries).
This will mean that when you loop over them, method names will appear as keys. If you are using a library, look at the documentation and look for...
Using do block vs braces {}
...u are doing a small operation, for example, a method call or a comparison, etc. so this makes perfect sense:
some_collection.each { |element| puts element }
But if you have slightly complex logic that goes to multiple lines then use do .. end like:
1.upto(10) do |x|
add_some_num = x + rand(10)...
How to view UTF-8 Characters in VIM or Gvim
...
In Linux, Open the VIM configuration file
$ sudo -H gedit /etc/vim/vimrc
Added following lines:
set fileencodings=utf-8,ucs-bom,gb18030,gbk,gb2312,cp936
set termencoding=utf-8
set encoding=utf-8
Save and exit, and terminal command:
$ source /etc/vim/vimrc
At this time VIM wil...
Add leading zeroes to number in Java? [duplicate]
...
(1) That's going to return 0num0num0num etc, instead of 00000num (2) Lots of string concatenations with "+" are a bad idea performance-wise. Better to preallocate a StringBuffer or StringBuilder of length 'digits'
– Nate Parsons
...
How do I look inside a Python object?
...veniences, like tab completion, pretty printing of results, result history etc. that make it very handy for this sort of exploratory programming.
For more programmatic use of introspection, the basic builtins like dir(), vars(), getattr etc will be useful, but it is well worth your time to check ou...
String comparison in Python: is vs. == [duplicate]
...or all built-in Python objects (like
strings, lists, dicts, functions,
etc.), if x is y, then x==y is also
True.
Not always. NaN is a counterexample. But usually, identity (is) implies equality (==). The converse is not true: Two distinct objects can have the same value.
Also, is it g...
How to create the perfect OOP application [closed]
...ct and ShoppingCartItem. Product should have the product name, tax status, etc. but not quantity. Quantity is not a property of a product - it'll be different for each customer of the company who buys that particular product.
ShoppingCartItem should have a Product and the quantity. That way the cust...
What is the MySQL JDBC driver connection string?
...("com.mysql.jdbc.Driver").newInstance ();
Connection conn = DriverManager.getConnection (url, "username", "password");
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Lightweight Javascript DB for use in Node.js [closed]
...mpatibilities (3 years in js dev is an eternity), issues that get ignored, etc. The right amount of stars but it doesn't scream fresh.
– Carles Alcolea
Dec 27 '18 at 10:35
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