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Issue 29371951: Noissue - Add some more JavaScript coding guidlines (Closed)
Patch Set: Addressed feedback Created Jan. 18, 2017, 10:25 a.m.
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1 title=Coding Style 1 title=Coding Style
2 2
3 3
4 <h2 id="precedence">{{s1 Precedence}}</h2> 4 <h2 id="precedence">{{s1 Precedence}}</h2>
5 5
6 <p>{{s2 The Adblock Plus coding style is based on others. Our rules (both genera l and language specific) always overrule referenced style guides. The language s pecific sections overrule the general section.}}</p> 6 <p>{{s2 The Adblock Plus coding style is based on others. Our rules (both genera l and language specific) always overrule referenced style guides. The language s pecific sections overrule the general section.}}</p>
7 7
8 <h2 id="consistency">{{s3 Consistency}}</h2> 8 <h2 id="consistency">{{s3 Consistency}}</h2>
9 9
10 <p>{{s4 Consistency is most important: Be consistent within functions, files, mo dules and projects. Making existing code conform with this style guide is fine, but it should happen in dedicated commits, preferably for a whole module or proj ect at once.}}</p> 10 <p>{{s4 Consistency is most important: Be consistent within functions, files, mo dules and projects. Making existing code conform with this style guide is fine, but it should happen in dedicated commits, preferably for a whole module or proj ect at once.}}</p>
11 11
12 <h2 id="general">{{s5 General}}</h2> 12 <h2 id="general">{{s5 General}}</h2>
13 <ul> 13 <ul>
14 <li>{{s6 Follow the Mozilla Coding Style's <a href="https://developer.mozilla. org/en-US/docs/Developer_Guide/Coding_Style#General_C.2FC.2B.2B_Practices">gener al practices</a> and its <a href="https://developer.mozilla.org/en-US/docs/Devel oper_Guide/Coding_Style#Naming_and_Formatting_code">naming and formatting rules< /a>.}}</li> 14 <li>{{s6 Follow the Mozilla Coding Style's <a href="https://developer.mozilla. org/en-US/docs/Developer_Guide/Coding_Style#General_C.2FC.2B.2B_Practices">gener al practices</a> and its <a href="https://developer.mozilla.org/en-US/docs/Devel oper_Guide/Coding_Style#Naming_and_Formatting_code">naming and formatting rules< /a>.}}</li>
15 <li>{{s8 All files should have a <a href="license-headers">license header</a>, but no mode line comments.}}</li> 15 <li>{{s8 All files should have a <a href="license-headers">license header</a>, but no mode line comments.}}</li>
16 <li>{{s9 Newline at end of file, otherwise no trailing whitespace.}}</li> 16 <li>{{s9 Newline at end of file, otherwise no trailing whitespace.}}</li>
17 <li>{{s10 Lines can be longer than the limit, if limiting line length would hu rt readability in a particular case.}}</li> 17 <li>{{s10 Lines can be longer than the limit, if limiting line length would hu rt readability in a particular case.}}</li>
18 <li>{{s11 Opening braces always go on their own line.}}</li> 18 <li>{{s11 Opening braces always go on their own line.}}</li>
19 <li>{{s12 No hungarian notation, no special variable name prefixes or suffixes denoting type or scope. All variable names start with a lower case letter.}}</l i> 19 <li>{{s12 No hungarian notation, no special variable name prefixes or suffixes denoting type or scope. All variable names start with a lower case letter.}}</l i>
20 <li>{{s13 Don't comment code out, delete it.}}</li> 20 <li>{{s13 Don't comment code out, delete it.}}</li>
21 <li>{{todo-comments Don't add TODO comments, create an <a href="https://issues .adblockplus.org">issue</a> and reference it in a comment instead.}}</li> 21 <li>{{todo-comments Don't add TODO comments, create an <a href="https://issues .adblockplus.org">issue</a> and reference it in a comment instead.}}</li>
22 </ul> 22 </ul>
23 23
24 <h2 id="javascript">{{s14 JavaScript}}</h2> 24 <h2 id="javascript">{{s14 JavaScript}}</h2>
25 <ul> 25 <ul>
26 <li>{{s15 Follow the Mozilla Coding Style's <a href="https://developer.mozilla .org/en-US/docs/Developer_Guide/Coding_Style#JavaScript_practices">JavaScript pr actices</a>.}}</li> 26 <li>{{s15 Follow the Mozilla Coding Style's <a href="https://developer.mozilla .org/en-US/docs/Developer_Guide/Coding_Style#JavaScript_practices">JavaScript pr actices</a>.}}</li>
27 <li>{{s16 Opening braces of object literals in don't go on their own line when that would cause a syntax error.}}</li> 27 <li>{{javascript-strict Always use <a href="https://developer.mozilla.org/docs /Web/JavaScript/Reference/Strict_mode">strict mode</a>.}}</li>
28 <li>{{s17 Use <code>bind()</code> to ensure the desired value of the <code>thi s</code> variable, don’t use temporary variables as a replacement.}}</li>
29 <li>{{s18 In classes, prefix private functions with a single underscore to mak e them pseudo-private.}}</li> 28 <li>{{s18 In classes, prefix private functions with a single underscore to mak e them pseudo-private.}}</li>
29 <li>{{javascript-opening-braces Opening braces of object literals don't go on their own line when that would cause a syntax error.}}</li>
Sebastian Noack 2017/01/18 10:54:31 FWIW, I think the braces rules are slightly more i
kzar 2017/01/18 11:10:08 Done.
30 <li>{{javascript-if-else-braces When an <code><fix>if</fix></code> statement, an <code><fix>else</fix></code> statement or a loop spans over more than one lin e always enclose it with braces. When an <code><fix>if</fix></code> or <code><fi x>else</fix></code> statement uses braces the opposing block should do too.}}</l i>
31 <h3 id="javascript-modern">{{javascript-es6 Modern JavaScript (where supported )}}</h3>
32 <ul>
33 <li>{{javascript-block-scoping Always use <a href="https://developer.mozilla .org/docs/Web/JavaScript/Reference/Statements/block#With_let_and_const">block-sc oping</a> (<code><fix>let</fix></code> / <code><fix>const</fix></code>), except when sharing global variables between scripts cannot be avoided.}}</li>
34 <li>{{javascript-const Use <code><fix>const</fix></code> for constant expres sions that could as well have been inlined (e.g. static parameters, imported mod ules, etc.).}}</li>
35 <li>{{javascript-arrow Use the <a href="https://developer.mozilla.org/docs/W eb/JavaScript/Reference/Functions/Arrow_functions">arrow function</a> syntax whe n passing anonymous functions that don't require the binding of their own <code> <fix>this</fix></code> or <code><fix>arguments</fix></code> variables.}}</li>
36 <li>{{javascript-method Use the <a href="https://developer.mozilla.org/docs/ Web/JavaScript/Reference/Functions/Method_definitions">method definition shortha nd</a> syntax when defining methods on an object.}}</li>
37 <li>{{javascript-for-of When iterating over arrays in the canonical order us e the new <a href="https://developer.mozilla.org/docs/Web/JavaScript/Reference/S tatements/for...of"><code><fix>for..of</fix></code></a> syntax if the loop index isn't required. (As opposed to using <code><fix>for(;;)</fix></code> or the <co de><fix>forEach()</fix></code> method.)}}</li>
Sebastian Noack 2017/01/18 10:54:31 I think using "rather" was fine. In fact I think i
kzar 2017/01/18 11:10:08 Done.
38 <li>{{javascript-map-set Use the <a href="https://developer.mozilla.org/docs /Web/JavaScript/Reference/Global_Objects/Map"><code><fix>Map</fix></code></a> or <a href="https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Obj ects/Set"><code><fix>Set</fix></code></a> objects, rather than misusing plain ob jects, when you need a hash table.}}</li>
39 </ul>
30 </ul> 40 </ul>
31 41
32 <h2 id="html-css">{{html-css HTML and CSS}}</h2> 42 <h2 id="html-css">{{html-css HTML and CSS}}</h2>
33 <ul> 43 <ul>
34 <li>{{html-css-general Follow the <a href="https://google.github.io/styleguide /htmlcssguide.xml">Google HTML/CSS Style Guide</a>.}}</li> 44 <li>{{html-css-general Follow the <a href="https://google.github.io/styleguide /htmlcssguide.xml">Google HTML/CSS Style Guide</a>.}}</li>
35 <li>{{html-css-quotation Use double over single quotation marks.}}</li> 45 <li>{{html-css-quotation Use double over single quotation marks.}}</li>
36 <li>{{html-css-optional-tag Don't omit optional HTML tags.}}</li> 46 <li>{{html-css-optional-tag Don't omit optional HTML tags.}}</li>
37 <li>{{html-css-hexadecimal CSS color values should be specified in hexadecimal where possible.}}</li> 47 <li>{{html-css-hexadecimal CSS color values should be specified in hexadecimal where possible.}}</li>
38 <li>{{html-css-shorthand CSS shorthand properties usage is optional.}}</li> 48 <li>{{html-css-shorthand CSS shorthand properties usage is optional.}}</li>
39 <li>{{html-css-order CSS rule declaration order should follow the <a href="htt ps://make.wordpress.org/core/handbook/best-practices/coding-standards/css/#prope rty-ordering">WordPress CSS Coding Standards</a>.}}</li> 49 <li>{{html-css-order CSS rule declaration order should follow the <a href="htt ps://make.wordpress.org/core/handbook/best-practices/coding-standards/css/#prope rty-ordering">WordPress CSS Coding Standards</a>.}}</li>
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75 <ul> 85 <ul>
76 <li>{{objc-conventions Follow Apple's <a href="https://developer.apple.com/lib rary/ios/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/Conventions/Co nventions.html">conventions</a>}}.</li> 86 <li>{{objc-conventions Follow Apple's <a href="https://developer.apple.com/lib rary/ios/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/Conventions/Co nventions.html">conventions</a>}}.</li>
77 </ul> 87 </ul>
78 88
79 <h2 id="puppet">{{s31 Puppet}}</h2> 89 <h2 id="puppet">{{s31 Puppet}}</h2>
80 <ul> 90 <ul>
81 <li>{{s32 Follow the <a href="http://docs.puppetlabs.com/guides/style_guide.ht ml">Puppet Style Guide</a>.}}</li> 91 <li>{{s32 Follow the <a href="http://docs.puppetlabs.com/guides/style_guide.ht ml">Puppet Style Guide</a>.}}</li>
82 <li>{{s33 Opening braces don't go on their own line.}}</li> 92 <li>{{s33 Opening braces don't go on their own line.}}</li>
83 <li>{{s34 Arrows should not be aligned.}}</li> 93 <li>{{s34 Arrows should not be aligned.}}</li>
84 </ul> 94 </ul>
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