Line length Open
First off, let's create a function that compares two objects to determine if **the first one contains equivalent property values to the second one**. This essentially means checking if the keys of the first object are a **superset** of the keys of the second object, and if the values of the first object are equal to the values of the second object.- 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
Comparing objects this way requires **iterating over the keys of the second object**, using `Object.keys()`, and checking if each key exists in the first object using `Array.prototype.every()`, `Object.prototype.hasOwnProperty()`.- 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.
Multiple headers with the same content Open
### Comparison by value- Read upRead up
- Exclude checks
MD024 - Multiple headers with the same content
Tags: headers
Aliases: no-duplicate-header
Parameters: allowdifferentnesting (boolean; default false)
This rule is triggered if there are multiple headers in the document that have the same text:
# Some text
## Some textTo fix this, ensure that the content of each header is different:
# Some text
## Some more textRationale: Some markdown parses generate anchors for headers based on the header name, and having headers with the same content can cause problems with this.
If the parameter allow_different_nesting is set to true, header duplication
under different nesting is allowed, like it usually happens in change logs:
# Change log
## 2.0.0
### Bug fixes
### Features
## 1.0.0
### Bug fixesLine length Open
excerpt: Compare two objects to determine if the first one contains equivalent property values to the second one.- 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
Given two JavaScript objects, it's not straightforward to compare them for equality. This is because objects are reference types, and two objects with the same properties and values are not considered equal. However, it's not difficult to implement a function that does just that.- 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
If, instead, we want to use a **custom function to determine value equality**, we can simply replace the strict equality operator with the provided function. This function will receive the value of the property in both objects, as well as the key and the objects themselves.- 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.
First header should be a top level header Open
## One-sided comparison- Read upRead up
- Exclude checks
MD002 - First header should be a top level header
Tags: headers
Aliases: first-header-h1
Parameters: level (number; default 1)
This rule is triggered when the first header in the document isn't a h1 header:
## This isn't a H1 header
### Another headerThe first header in the document should be a h1 header:
# Start with a H1 header
## Then use a H2 for subsectionsMultiple headers with the same content Open
### Comparison using a custom function- Read upRead up
- Exclude checks
MD024 - Multiple headers with the same content
Tags: headers
Aliases: no-duplicate-header
Parameters: allowdifferentnesting (boolean; default false)
This rule is triggered if there are multiple headers in the document that have the same text:
# Some text
## Some textTo fix this, ensure that the content of each header is different:
# Some text
## Some more textRationale: Some markdown parses generate anchors for headers based on the header name, and having headers with the same content can cause problems with this.
If the parameter allow_different_nesting is set to true, header duplication
under different nesting is allowed, like it usually happens in change logs:
# Change log
## 2.0.0
### Bug fixes
### Features
## 1.0.0
### Bug fixesLine length Open
In order to compare the values of the properties, we can simply use the strict equality operator (`===`). This will ensure that the values are not only equal but also of the same type.- 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
For custom value comparison, you can use the same approach as before, using a custom function to determine value equality.- 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
If you want to compare two objects in **both directions**, you can create a `Set` of the keys of both objects and check if the **size of the set** is equal to the number of keys in each object. Then, you can use the same approach as before, except iterating over the keys of the set and checking if **each key exists in both objects**.- 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.