Showing 612 of 612 total issues
Line length Open
Функция `strange` действительно странная, ведь она игнорирует свой аргумент и просто возвращает число `22`. И всё же при запуске этой программы вы гарантированно получите ошибку `Floating point exception`, ибо компилятор языка C категорически не терпит деления на ноль. А всё потому, что язык C придерживается энергичной модели вычислений: оператор деления `2` на `0` будет вызван ещё до того, как мы войдём в тело функции `strange`, поэтому программа упадёт.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
Ленивый подход вполне гармонирует со своим названием: нам лень делать работу сразу же. Вместо этого мы, подобно ребёнку, которого заставили убрать разбросанные по комнате игрушки, откладываем работу до последнего. Ленивая модель гарантирует, что работа будет выполнена лишь тогда, когда результат этой работы кому-то понадобится. Если же он никому не понадобится, тогда работа не будет выполнена вовсе.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
50 миллионов элементов, а значит, 50 миллионов раз сложение второго аргумента с единицей будет откладываться, накапливая гигантский «хвост» из (пока что) невычисленных выражений. Хотите знать, что произойдёт при запуске такой программы? Её выполнение, на MacBook Pro 2014 года, займёт приблизительно 63 секунды и скушает, ни много ни мало, 6,4 ГБ памяти! А теперь представьте, что случилось бы, если бы элементов в списке было не 50 миллионов, а 50 миллиардов...- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Dollar signs used before commands without showing output Open
```bash- Read upRead up
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MD014 - Dollar signs used before commands without showing output
Tags: code
Aliases: commands-show-output
This rule is triggered when there are code blocks showing shell commands to be typed, and the shell commands are preceded by dollar signs ($):
$ ls
$ cat foo
$ less barThe dollar signs are unnecessary in the above situation, and should not be included:
ls
cat foo
less barHowever, an exception is made when there is a need to distinguish between typed commands and command output, as in the following example:
$ ls
foo bar
$ cat foo
Hello world
$ cat bar
bazRationale: it is easier to copy and paste and less noisy if the dollar signs are omitted when they are not needed. See http://www.cirosantilli.com/markdown-styleguide/#dollar-signs-in-shell-code for more information.
Ordered list item prefix Open
4. EPUB: `epub/ohaskell.epub`.- Read upRead up
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MD029 - Ordered list item prefix
Tags: ol
Aliases: ol-prefix
Parameters: style ("one", "ordered"; default "one")
This rule is triggered on ordered lists that do not either start with '1.' or do not have a prefix that increases in numerical order (depending on the configured style, which defaults to 'one').
Example valid list if the style is configured as 'one':
1. Do this.
1. Do that.
1. Done.Example valid list if the style is configured as 'ordered':
1. Do this.
2. Do that.
3. Done.Line length Open
Впрочем, с концептуальной точки зрения способ всего один. Задумаемся: если в примере выше лень явилась причиной откладывания сложений на потом, что же можно сделать? Ответ прост: мы должны убрать излишнюю ленивость и заменить её строгостью. В этом случае применение оператора сложения уже не будет откладываться до последнего, а будет производиться тут же, как в языках со строгой моделью вычислений.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
Функция `toUpper` определена в модуле `Data.Char`, который, в свою очередь, живёт в стандартной библиотеке. Библиотек есть множество, но стандартная лишь одна. Она содержит самые базовые, наиболее широко используемые инструменты. А прежде чем продолжить, зададимся важным вопросом: «Где живут все эти библиотеки?» Они живут в разных местах, но главное из них — Hackage.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
Впрочем, не кажется ли вам подобная форма слишком длинной? В упомянутом ранее стандартном модуле `GHC.IO.Encoding.UTF8` есть функция `mkUTF8`, и представьте себе:- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
Hackage — это центральный репозиторий Haskell-библиотек, или, как принято у нас называть, пакетов (англ. package). Название репозитория происходит от слияния слов `Haskell` и `package`. Hackage существует с 2008 года и живёт [здесь](http://hackage.haskell.org/). Ранее упомянутая стандартная библиотека тоже живёт в Hackage и называется она `base`. Каждой библиотеке выделена своя страница.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
в имени модуля отражена иерархия пакета. `Data.Char` означает, что внутри пакета `base` есть каталог `Data`, внутри которого живёт файл `Char.hs`, открыв который, мы увидим:- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
Проверено на OS X Yosemite, [stack 1.0.2](http://docs.haskellstack.org/en/stable/README/), [pandoc 1.15.2.1](https://github.com/jgm/pandoc/releases/tag/1.15.2) и [LTS Haskell 5.5](https://www.stackage.org/lts-5.5).- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
Получается эдакий конвейер: на входе строка с IP-адресом, на выходе — сообщение в нашем терминале. Существует иной способ соединения двух функций воедино.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
Необычно? Перед нами два новых стандартных оператора, избавляющие нас от лишних скобок и делающие наш код проще. Оператор `.` — это оператор композиции функций (англ. function composition), а оператор `$` — это оператор применения (англ. application operator). Эти операторы часто используют совместно друг с другом. И отныне мы будем использовать их чуть ли не в каждой главе.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
Кстати, а каков тип списка `functions`? Его тип таков: `[String -> String]`. То есть список функций с одним аргументом типа `String`, возвращающих значение типа `String`.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
Такое объявление сообщает нам о том, что функция `square` принимает единственный аргумент типа `Int` и возвращает значение того же типа `Int`. Если же аргументов более одного, объявление просто вытягивается. Например, объявление функции `prod`, возвращающей произведение двух целочисленных аргументов, могло бы выглядеть так:- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
Удивительно, но в Haskell очень мало встроенных типов, то есть таких, о которых компилятор знает с самого начала. Есть `Int`, есть `Double`, `Char`, ну и ещё несколько. Все же остальные типы, даже носящие статус стандартных, не являются встроенными в язык. Вместо этого они определены в стандартной или иных библиотеках, причём определены точно так же, как мы будем определять и наши собственные типы. А поскольку без своих типов написать сколь-нибудь серьёзное приложение у нас не получится, тема эта достойна самого пристального взгляда.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
Каждый из Hackage-пакетов живёт по адресу, сформированному по неизменной схеме: `http://hackage.haskell.org/package/ИМЯПАКЕТА`. Так, дом стандартной библиотеки — `http://hackage.haskell.org/package/base`. Hackage — открытый репозиторий: любой разработчик может добавить туда свои пакеты.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
Но если я вас ещё не убедил, давайте определим собственный оператор композиции функций! Помните, я говорил вам, что ASCII-символы можно гибко объединять в операторы? Давайте возьмём плюс со стрелками, он чем-то похож на объединение. Пишем:- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
В предыдущей главе мы познакомились с функциями и выражениями, увидев близкую связь этих понятий. В этой главе мы познакомимся с функциями поближе, а также узнаем, что такое «чисто функциональный» язык и почему в нём нет места оператору присваивания.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
Функция `workingDays` возвращает список типа `[Day]`, и в случае пятидневной рабочей недели, отражённой конструктором `FiveDays`, этот список сформирован пятью конструкторами, а в случае шестидневной — шестью конструкторами.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.