2 METACODE PDF

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) ().

Author: Tygokus Sharisar
Country: Greece
Language: English (Spanish)
Genre: Sex
Published (Last): 22 June 2009
Pages: 175
PDF File Size: 10.18 Mb
ePub File Size: 3.15 Mb
ISBN: 619-9-86076-167-9
Downloads: 52672
Price: Free* [*Free Regsitration Required]
Uploader: Arashimi

Metackde 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. Three parts of a code base help:.

So if you are as clever as you can be when you write it, how will you ever debug it? For details and more examples, consult Pattern: Avoid global variables Best Practice: The rationale is that this is what a named function expression looks like if you remove the name:.

6.2 Metacode

JavaScript has many great style guides. Prefer Literals to Constructors. If those functions are small enough and have meaningful names, you can often avoid comments. It should also contain a glossary for all important concepts. As an addendum to the previous rule: However, you have to find ways to recover gracefully from failure when your code is in production.

Chapter A Meta Code Style Guide

If you are inside a block, stay inside that block As an addendum to the previous rule: Thus, there is no need to write yet another one.

It should tell you how to get started with the code base and provide you with the big picture.

Instead, this chapter describes meta style rules metqcode surveys existing style guides and established best practices. A majority metacodw JavaScript programmers agree on the following best practices: Put the conditional operator in parentheses This helps with reading, because it is easier to make out the scope of the operator: The rationale is that such functions are easier to call and understand.

Code Should Be Easy to Understand. Code should explain what is happening; it should be self-explanatory. Someone reading the code can then turn to the documentation to find out more about the concept.

Coercing Coerce a value to a type via BooleanNumberStringObject used as functions—never use those functions as constructors.

Whenever you are considering a style question, ask yourself: Commonly Accepted Best Practices. JavaScript is only so forgiving e. When it comes to style, there are many decisions to make.

Sometimes you have no choice but to optimize the performance of your code. Everyone knows that debugging is twice as hard as writing a program in the first place. Avoid the pitfalls of automatic metackde insertion see Automatic Semicolon Insertion. If you use methods generically, you can abbreviate Object. The larger the team, the more important it is to check for adherence to the style automatically, via tools such as JSHint.

The rationale is that this is what a named function expression looks like if you remove the name: But it reduces clutter, and I expect engines to eventually optimize this pattern.

Several constructors produce objects that can also be created by literals. However, it is usually better to use a more explicit alternative such as Math.

I also like to keep object-oriented and functional mechanisms separate: And you should be aware that you can return any object in a constructor. Coerce a value to a type via BooleanNumberStringObject used as functions—never use metaode functions as constructors.

It is thus important to make the former as easy as possible. Converting a number to an integer.