Mastering Ruby Blocks Video Course: Enumerable Part II
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Jun 12, 2019 Jun 3, 2019 Jun 3, 2019 Jun 16, 2019 This Ruby style guide recommends best practices so that real-world Ruby programmers can write code that can be maintained by other real-world Https://money-free-games.website/ruby-code/ruby-fortune-no-deposit-bonus-codes.html programmers.
A style guide that reflects real-world usage gets used, while a style guide that holds to an ideal that has been rejected by the people it is supposed to help risks not getting used at all - no matter how good it is.
The guide is separated into several sections of related guidelines.
This style guide evolves over time as additional conventions are identified and past conventions are rendered obsolete by changes in Ruby itself.
The guidelines provided here are intended to improve the readability of code and make it consistent across the wide spectrum of Ruby code.
They are also meant to reflect real-world usage of Ruby instead of a random ideal.
Rallying people around the cause of community standards ruby code style a lot of time and energy, and we still have a lot of ground to cover.
Ruby is famously optimized for programmer happiness.
A foolish consistency is the hobgoblin of little minds, adored by little statesmen and philosophers and divines.
A style guide is about consistency.
Consistency with this style guide is important.
Consistency within a project is more important.
Consistency within one class or method is the most important.
When in doubt, use your best judgment.
Look at other examples and decide what looks best.
Nearly everybody is convinced that every style but their own is ugly and unreadable.
Whitespace might be mostly irrelevant to the Ruby interpreter, but its proper use is the key to writing easily readable code.
For hash literals two styles are considered acceptable.
The first variant is slightly more readable and arguably more popular in the Ruby community in general.
The second variant has the advantage of adding visual difference between block and hash literals.
Whichever one you pick - apply it consistently.
Historically it is derived from the fact that case and switch statements are not blocks, hence should not be indented, and the when and else keywords are labels compiled in the C language, they are literally labels for JMP calls.
When assigning https://money-free-games.website/ruby-code/ruby-error-codes.html result of a conditional expression to a variable, preserve the usual alignment of its branches.
In practice, avoid using line continuations for anything but string concatenation.
There are two popular styles in the Ruby community, both of which are considered good - leading.
When aligning parameters is not appropriate due to line-length constraints, single indent for the lines after the first is also acceptable.
The names of predicate methods methods that return a boolean value should end in a question mark i.
Avoid prefixing predicate methods with the auxiliary verbs such as is, does, or can.
These words are redundant and inconsistent with the style of boolean methods in the Ruby core library, such as empty?
This convention is recognized by the Ruby interpreter and tools like RuboCop and will suppress their unused variable warnings.
Symmetrical semantics means both sides of the operator are typically of same or coercible types.
Note that the rule should be followed only if both sides of the operator have the same semantics.
Most of the time iterators should be used instead.
This also means that ternary operators must not be nested.
If you want to do a nil check, use nil?
The minimal added readability is just not worth the high probability of introducing subtle bugs.
It is only required when calling a self write accessor, methods named after reserved words, or overloadable operators.
A guard clause is a conditional statement at the top of a function that bails out as soon as it can.
Do not return from an ensure block.
If you explicitly return from a method inside an ensure block, the return will take precedence over any exception being raised, and the method will return as if no exception had been raised at all.
In effect, the exception will be silently thrown away.
This will trap signals and calls to exit, requiring you to kill -9 the process.
Parallel assignment is allowed when it is the return of a method call, used with the splat operator, or when used to swap variable assignment.
Parallel assignment is less readable than separate assignment.
Named underscore variables are to be preferred over underscore variables because of the context that they provide.
Trailing underscore variables are necessary when there is a splat variable defined on the left side of the assignment, and the splat variable is not an underscore.
Consider what would happen if the current value happened to be false.
As its name implies it is meant to be used implicitly by case expressions ruby code style outside of them it yields some pretty confusing code.
The stricter comparison semantics provided by eql?
Consider using explicit block argument to avoid writing block literal that just passes its arguments to another block.
Beware of the performance impact, though, as the block gets converted to a Proc.
Nested method definitions actually produce methods in the same scope e.
Furthermore, the "nested method" will be redefined every time the method containing its definition is invoked.
Use the lambda method for multi-line blocks.
Ideally, most methods will be shorter than 5 LOC.
Empty lines do not contribute to the relevant LOC.
Although they are somewhat popular in the wild, there are a few peculiarities about their definition syntax that make their use undesirable.
At any rate - there should be no more than one expression in a single-line method.
Do not use :: for regular method invocation.
Decide what is appropriate for your usage.
Define optional arguments at the end of the list of arguments.
Ruby has some unexpected results when calling methods that have optional arguments at the front of the list.
Try to have such nested classes each in their own file in a folder named like the containing class.
Classes should be used only when it makes sense to create instances out of them.
Extending it introduces a superfluous class level and may also introduce weird errors if the file is required multiple times.
Class instance variables should usually be preferred over class variables.
Assign proper visibility levels to methods private, protected in accordance with their intended usage.
Indent the public, protected, and private methods as much as the method definitions they apply to.
Leave one blank line above the visibility modifier and one blank line below in order to emphasize that it applies to all methods below it.
This makes the code easier to refactor since the class name is not repeated.
Since alias, like def, is a keyword, prefer bareword arguments over symbols or strings.
In other words, do alias foo bar, not alias :foo :bar.
Also be aware of how Ruby handles aliases and inheritance: an alias references the method that was resolved at the time the alias was defined; it is not dispatched dynamically.
This is often seen in "service classes" or other similar concepts where a class is treated as though it were a function.
This convention tends to reduce repetitive ruby code style in such classes.
In ruby, instance variables beginning with an are nil until assigned a value, so in most cases the disjunction is unnecessary.
Good code is its own best documentation.
Improve the code and then document it to make it even clearer.
If the how can be made self-documenting, but not the why e.
Refactor the code to make it self-explanatory.
It may be related to the BarBazUtil upgrade.
This usage should be the exception and not the rule.
Use HACK to note code smells where questionable coding practices were used and should be refactored away.
Use REVIEW to note anything that should be looked at to confirm it is commit pokemon ruby gameshark codes for pokemons Such as intended.
For example: REVIEW: Are we sure this is how the client does X currently?
Place magic comments above all code and documentation in a file except shebangs, which are discussed next.
Apply this rule only to arrays with two or more elements.
Apply this rule only to arrays with two or more elements.
Avoid comma after the last item of an Array or Hash literal, especially when the items are not on separate lines.
Set implements a collection of unordered values with no duplicates.
This is a hybrid of Array's intuitive inter-operation facilities and Hash's fast lookup.
When providing an accessor for a collection, provide an alternate form to save users from checking for nil before accessing an element in the collection.
The rhyming methods are inherited from Smalltalk and are not common in other programming languages.
For Enumerable objects other than Array it will iterate the entire collection in order to determine its size.
This does not apply for arrays with a depth greater than 2, i.
Even in the worst case where a class does not provide a specialized implementation, the general implementation inherited from Enumerable will be at least as efficient as using reverse.
Do not use 0d prefix for decimal literals.
Since Fixnum is platform-dependent, checking against it will return different results on 32-bit and 64-bit machines.
Integer Prefer to use ranges when generating random numbers instead of integers with offsets, since it clearly states your intentions.
Imagine simulating a roll of a dice: When ruby code style float-division on two integers, either use fdiv or convert the left-side integer receiver to float.
There are two popular styles in the Ruby community, both of which are considered good - single quotes by default and double quotes by default.
Prefer double-quotes unless your string literal contains " or escape characters you want to suppress.
Concatenation mutates the string instance in-place and is always faster than String +, which creates a bunch of new string objects.
Delimiters add valuable information about the heredoc content, and as an added bonus some editors can highlight code within heredocs if the correct delimiter is used.
SUMMARY Place method calls with heredoc receivers on the first line of the heredoc definition.
The bad form has significant potential for error if a new line is added or removed.
The bad form has potential for error if the new line before the closing parenthesis is removed.
Avoid using numbered groups as it can be hard to track what they contain.
Named groups can be used instead.
This makes them more readable and you can add some useful comments.
Just be careful as spaces are ignored.
For multi-line strings, prefer heredocs.
Regular string literals are more readable and should be preferred unless a lot of characters would have to be escaped in them.
Avoid the use of %s.
It seems that the community has decided :"some string" is the preferred way to create a symbol with spaces in it.
} good %q "Test's king!
Instead it will send a message via UDP socket.
They cannot be preceded by whitespace and are not as easy to spot as regular comments.
This text is assumed to be documentation in.
You can read more about it.
Apart from being more concise and clear, warn allows you to suppress warnings if you need to by setting the warn level to 0 via -W0.
They are quite cryptic and their use in anything but one-liner scripts is discouraged.
Avoid hashes as optional parameters.
Does the method do too much?
Object initializers are exceptions for this rule.
Use OptionParser for parsing complex command line options and ruby -s for trivial command line options.
RuboCop already covers a significant portion of the Guide and plugins for most popular Ruby editors and IDEs.
This guide started its life as an internal company Ruby coding guidelines written by.
Bozhidar had always been bothered as a Ruby developer about one thing - Python developers had a great programming style reference and Rubyists never got an official guide, documenting Ruby coding style and best practices.
Bozhidar firmly believed that style matters.
He also believed that a great hacker community, such as Ruby has, should be quite capable of producing this coveted document.
But the world could certainly benefit from a community-driven and community-sanctioned set ruby code style practices, idioms and style prescriptions for Ruby programming.
Thanks for all the suggestions and the support!
Together we can make a resource beneficial to each and every Ruby developer out there.
Improving such guidelines is a great and simple way to help the Ruby community!
Nothing written in this guide is set in stone.
Tweet about the guide, share it with your friends and colleagues.
Every comment, suggestion or opinion we get makes the guide just a little bit better.
According to this the format used to be popular until the early 2000s when it was superseded by RDoc.
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If you cooperate with someone and they use a different style, it can seriously damage the code readability, to the point that a significant time is spent on either understanding code, or on rewrites (hated by both the rewriter and the original coder, although for different reasons). For example:
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