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) ().

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Chapter A Meta Code Style Guide

The model is written English: Sometimes you can be clever in JavaScript—if the cleverness has become an established pattern. When it comes to style, there are many decisions to make.

I like relatively tight whitespace. The preceding code has the same effect and intention as the following code, which is mftacode it should be written that way:. 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. If those functions are small enough and have meaningful names, you can often avoid comments.

6.2 Metacode

Single quotes are more common. The bodies of control flow statements are always put in braces, even if there is only a single statement. The latter is normally the better choice: Your code better fits into the JavaScript mainstream and is more likely to be portable metacods frameworks. Avoid the pitfalls of automatic semicolon insertion see Automatic Semicolon Insertion.

I also like to keep object-oriented and functional mechanisms separate: If you use methods generically, you can abbreviate Object. Much cleverness is directed at these optimizations. I even prefer the first of the following two conditions, even though they are equivalent: They will jump in anywhere and should be able to roughly understand what is going on. In modern engines, using instances of constructors is very fast e. It makes JavaScript a cleaner language see Strict Mode. To write such code, use descriptive identifiers and break up long functions or methods into smaller subfunctions.


Three parts of a code base help:. Avoid global variables Best Practice: Coerce a value to a type via BooleanNumberStringObject used as functions—never use those functions as constructors. Several constructors produce objects that can also be created by literals.

Code Should Be Consistent. Here are some guidelines for doing that:. Changing undefined explains why.

Here, a block is more closely associated with the header of its statement; it starts after it, in the same line. For most code, the time used for reading it is much greater than the time used for writing it.

RAVE – the Radial Velocity Experiment

Documentation should fill in the blanks left by the code and the comments. The rationale is that metacove convention is more descriptive: Tight whitespace I like relatively tight whitespace.

The larger the team, the more important it is to check for adherence to the style automatically, via tools such as JSHint. It should tell you how to get started with the code base and provide you with the big picture. Two brace styles are most common in C-like languages such as Java and JavaScript: One reason metacodde that is objective.

How much whitespace after parentheses, between statements, etc. And there are spaces after commas: If you return an object literal, you must put metacide 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: A Meta Code Style Guide.


Most code bases are filled with new ideas and concepts. I prefer four spaces per level of indentation, because that makes the indentation more visible. The advantages of this approach are that deleting, inserting, and rearranging lines is simpler and the lines are automatically indented correctly. Obviously, an object literal is not a code block, but things look more consistent and you are less likely to make mistakes if both are formatted the same way.

Whenever you are considering a style question, ask yourself: It is metzcode important to make the former as easy as possible.

This kind of local encapsulation makes a code fragment easier to understand in isolation. As an addendum to metackde previous rule: It is a hack you are accessing a prototype property via an instance. JavaScript, the winning style examines what the majority of several popular style guides recommend.

As an exception, I omit braces if a statement can be written in a single line. In contrast to textbooks, the added challenge with code is that people will not read it linearly. More tips for using constructors are mentioned in Tips for Implementing Constructors.

First, familiar things are metacoce to understand.

This helps with reading, because it is easier to make out the scope of the operator: