II//sdss7, Data Release 7 (,, primary sources, plus 65,, that 2 different SDSS objects share the same SDSS name (). 1. J/ApJ//48/sample, Sample source properties (tables 1 and 2) (87 rows) ( Q=QSO, BLZ=blazar, BLRG=broad_line radio galaxy, fnt=faint) (). [0/1] Fmag quality of the PSF fitting Qfit () (CODE_QUALITY). f_Fmag, [0/7] Quality flag (best=1) on Fmag (Note 2) ().
|Published (Last):||2 September 2007|
|PDF File Size:||15.83 Mb|
|ePub File Size:||1.80 Mb|
|Price:||Free* [*Free Regsitration Required]|
But it reduces clutter, and I expect engines to eventually optimize this pattern. For details and more examples, consult Pattern: Other considerations are mentioned in String Literals. How much whitespace after parentheses, between statements, etc. If you return an object literal, you must put the opening brace in the same line as the keyword returnlike this otherwise, automatic semicolon insertion inserts a semicolon after returnmeaning that nothing is returned; see Pitfall: I like relatively tight whitespace.
Commonly Accepted Best Practices. When it comes to style, there are many decisions to make.
Several constructors produce objects that can also be created by literals. In the latter case, they return a value and while there is a mnemonic, you still need to think to figure out what is going on: They make it easier to work with HTML code which normally metwcode attribute values in double quotes.
This kind of local encapsulation makes a code fragment easier to understand in isolation.
They will jump in anywhere and should be able to roughly understand what is going on. It is also easier to remove the code fragment or to move it somewhere else.
The idea is to complement existing style guides rather than to replace them. This helps with reading, because it is easier to make out the scope of the operator: As an exception, I omit braces if a statement can be written in a single line. This is more self-explanatory and safer than comparing with undefined or checking metacore truthiness:.
In other words, you can declare a variable in the context in which it is used inside a loop, inside a then block or an else block, etc. Avoid the pitfalls of automatic semicolon insertion see Automatic Semicolon Insertion. However, you have to find ways to recover gracefully from failure when your code is in production. I also like to keep object-oriented and functional mechanisms separate: The bodies of control flow statements are always put in braces, even if there is only a single statement.
That can mean that using familiar, slightly more verbose, constructs can be preferable.
Here are some guidelines for doing that:. In modern engines, using instances of constructors is very fast e.
RAVE – the Radial Velocity Experiment
Three parts of a code base help:. The shift operator can be used to convert a number to an integer. Code Should Be Consistent. Good code is like a textbook Most code bases are filled with new ideas and concepts. It is thus important to make the former as easy as possible.
The latter is normally the better choice: In contrast to textbooks, the added challenge with code is that people will not read it linearly. Someone reading the code can then turn to the documentation to find out more about the concept.
It also mentions practices I like that are more controversial. And you should be aware that you can return any object in a constructor.
Most code bases are filled with new ideas and concepts.