GitHub - radical-edo/js-style-guide

Dictionary

Some terms are used in this style guide, which may be confusing for a reader

class - will refere to any method of serving objects, wheter it's a ES6 classes which basically are CoffeeScript classes, or those are object factories. Examples:

var ClassName = (function () { // ES6/CoffeeScript class pattern in ES5
  function ClassName() {}

  ClassName.prototype.instanceMethod = function () {
  };

  return ClassName;
})();

var classInstance = new ClassName();

var factoryName = function () { // object factory pattern
  var factoryInstance = {};

  factoryInstance.instanceMethod = function () {
  };

  return factoryInstance;
};

var factoryObject = factoryName();

const reverse to variables that cannot be changed and are only once defined. This is a feature of ES6, however in ES5 you have to keep that in mind when coding.

General Rules

use 'use strict'; mode
always prefer functional programing over procedual. Meaning write a lot of small functions instead of one big function that does everything. Doing so will facilitate function chains, which in turn improve code readability
a class should have at the most 100 lines of code.
a single line of code should have at the most 100 columns wide. white spaces count
in every project you should always include at least some sort of utility library, examples: lodash, mout the reason being we don't want to re-invent the wheel. maybe you won't need them in the first few days of development. but down line..., you will.

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Code formatting and styling

semicolons Yup.

// bad
(function() {
  var name = 'Skywalker'
  return name
})()

// good
(function() {
  var name = 'Skywalker';
  return name;
})();

// good
;(function() {
  var name = 'Skywalker';
  return name;
})();

Leading commas: Nope.

// bad
var hero = {
    firstName: 'Bob'
  , lastName: 'Parr'
  , heroName: 'Mr. Incredible'
  , superPower: 'strength'
};

// good
var hero = {
  firstName: 'Bob',
  lastName: 'Parr',
  heroName: 'Mr. Incredible',
  superPower: 'strength'
};

Additional trailing comma: Nope. This can cause problems with IE6/7 and IE9 if it's in quirksmode. Also, in some implementations of ES3 would add length to an array if it had an additional trailing comma. This was clarified in ES5 (source):

Edition 5 clarifies the fact that a trailing comma at the end of an ArrayInitialiser does not add to the length of the array. This is not a semantic change from Edition 3 but some implementations may have previously misinterpreted this.

```javascript
// bad
var hero = {
  firstName: 'Kevin',
  lastName: 'Flynn',
};

var heroes = [
  'Batman',
  'Superman',
];

// good
var hero = {
  firstName: 'Kevin',
  lastName: 'Flynn'
};

var heroes = [
  'Batman',
  'Superman'
];
```

Use soft tabs set to 2 spaces

// bad
function () {
∙∙∙∙var name;
}

// bad
function () {
∙var name;
}

// good
function () {
∙∙var name;
}

Place 1 space before the leading brace.

// bad
function test(){
  console.log('test');
}

// good
function test() {
  console.log('test');
}

// bad
dog.set('attr',{
  age: '1 year',
  breed: 'Bernese Mountain Dog'
});

// good
dog.set('attr', {
  age: '1 year',
  breed: 'Bernese Mountain Dog'
});

Set off operators with spaces.

// bad
var x=y+5;

// good
var x = y + 5;

End files with a single newline character.

// bad
(function(global) {
  // ...stuff...
})(this);

// bad
(function(global) {
  // ...stuff...
})(this);↵
↵

// good
(function(global) {
  // ...stuff...
})(this);↵

Use indentation when making long method chains.

// bad
$('#items').find('.selected').highlight().end().find('.open').updateCount();

// good
$('#items')
  .find('.selected')
    .highlight()
    .end()
  .find('.open')
    .updateCount();

// bad
var leds = stage.selectAll('.led').data(data).enter().append('svg:svg').class('led', true)
    .attr('width',  (radius + margin) * 2).append('svg:g')
    .attr('transform', 'translate(' + (radius + margin) + ',' + (radius + margin) + ')')
    .call(tron.led);

// good
var leds = stage.selectAll('.led')
    .data(data)
  .enter().append('svg:svg')
    .class('led', true)
    .attr('width',  (radius + margin) * 2)
  .append('svg:g')
    .attr('transform', 'translate(' + (radius + margin) + ',' + (radius + margin) + ')')
    .call(tron.led);

naming
- class names are pascal cased with the exception of factory patter - this has to be camel cased
- instance names, variable names, functions names are camel cased
- const names are capitalized and snaked cased - example THIS_IS_A_CONST_VARIABLE = 12 Idea is for this variable to stand out and inform the developer no to re-define this variable.

require if in CommonJS envrioment. require in the following order (and always on top of the file):

core modules
npm modules
others

with space in between each type of requires, example:

var fs = require('fs');
var path = require('path');

var _ = require('lodash');
var Promise = require('bluebird');

var User = require('../models/user');
var Post = require('../models/post');

module.exports
- is only called once per file
- no need to crawl through the file and see what has been exported. it should always be visible and easy to find
- exported value is always at the end of the file.
- nothing can be written after the export statment

Do not use the .js when requiring modules

  // bad
  var Batmobil = require('./models/Car.js');

  // good
  var Batmobil = require('./models/Car');

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file names

Although the convetion in JavaScript any names are usally camel cased the file names should be snaked cased, mening: user_store.js over userStore.js or UserStore.js or even userstore.js. Mostly because for git there is no difference between last 3 examples.
if..else

// good
if (/* condition */) {
} else {
}

function

// good
function () {
}

function namedFn() {
}

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Asynchronous code

prefer promises over callbacks

As a general rule when you need to handle an asynchronus code use promises if this at all possible. If handling with a bult-in method that doesn't return a promise consider wrapping that peace of code and return a promise

  function readFromFile(filePath) {
    return new Promise(function (resolve, reject) {
      fs.readFile(filePath, function (err, data) {
        if (err) {
          return reject(err);
        }
        resolve(data);
      });
    });
  })

  readFromFile('package.json')
    .then(function (data) {
    })
    .catch(function (err) {
    })

Or if you have bluebird package available (which you should), consider using Promise.promisifyAll

var fs = require('fs');

var Promise = require('bluebird');

Promise.promisifyAll(fs);

fs.readFileAsync('package.json')
  .then(function (data) {})
  .catch(function (err) {});

More on [promisifcation|https://github.com/petkaantonov/bluebird/blob/master/API.md#promisification]

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Objects

Use the literal syntax for object creation.

// bad
var item = new Object();

// good
var item = {};

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Loops

don't use traditional loops to iterate over an array, use bult-in js methods like forEach, map

// bad
function (arr) {
  for (var i = 0; i < arr.length; i++) {
    // do stuff
  }
}

// good
function (arr) {
  arr.forEach(function (el, i) {
    // do stuff
  });
}

// bad
function (arr) {
  for (var i = 0; i < arr.length; i++) {
    // do stuff
  }
  return arr;
}

// good
function (arr) {
  return arr.map(function (el, i) {
    // do stuff
  });
}

reason behind this. promotes a chainable code which is nicely readable and for loop has a small side effect. the index/iterator value after the loop has finished is set to whatever index was last used.

to iterate over the Object props use a utility function library (if lodash that would be forOwn)

or at least

Object.keys(obj).forEach(function (prop) {
  // do stuff
});

Conditionals

switch..case
- do not use it
  
  generally switch..case promotes a big function that has a tendency to blow out of a proportion hard to maintain and over time. such function will have a big cyclomatic complexity
- instead use one of the following
  
  as strategyPattern
  
  or us inheritance
- as a side note switch..case can have up to 128 case-clauses, any more than that and the function is not optimizable
if..else
- try to avoid if..else if..else
  
  meaning this
```
if () {
} else if () {
} else {
}
```
  for the same reasons as why not to use switch..case the function will grow in size and becomes hard to maintain if the else..if will be added and added.

Arrays

Use the literal syntax for array creation

// bad
var items = new Array();

// good
var items = [];

If you don't know array length use Array#push.

var someStack = [];


// bad
someStack[someStack.length] = 'abracadabra';

// good
someStack.push('abracadabra');

When you need to copy an array use Array#slice. jsPerf

var len = items.length;
var itemsCopy = [];
var i;

// bad
items.forEach(function (item, i) {
  itemsCopy[i] = item;
});

// good
itemsCopy = items.slice();

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Arguments

arguments are a bit tricky since they are wrong usage can cause optimization problems. Only the following usages is considered safe.

arguments.length
arguments[i], where i is always a valid integer index into the arguments, and cannot be out of bound

Function#apply, meaning

var instance = new Instance();
var fn = function fn() {}

(function () {
  fn.apply(instnace, arguments);
})('a', 'b', 'c', 'd');

is ok.

to operate on arguments and treat is a array-like object you would have to write your own utility functions to wrap the code. this is where lodash comes helpful. using lodash's function will solve this problem for us
```
(function () {
  return _.map(arguments, function (arg, i) { 
    return arg;
  }).join(', ');
})('a', 'b');
```

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Strings

Use single quotes '' for strings

// bad
var name = "Bob Parr";

// good
var name = 'Bob Parr';

// bad
var fullName = "Bob " + this.lastName;

// good
var fullName = 'Bob ' + this.lastName;

Strings longer than 80 characters should be written across multiple lines using string concatenation.

Note: If overused, long strings with concatenation could impact performance. jsPerf & Discussion

// bad
var errorMessage = 'This is a super long error that was thrown because of Batman. When you stop to think about how Batman had anything to do with this, you would get nowhere fast.';

// bad
var errorMessage = 'This is a super long error that was thrown because \
of Batman. When you stop to think about how Batman had anything to do \
with this, you would get nowhere \
fast.';

// good
var errorMessage = 'This is a super long error that was thrown because ' +
  'of Batman. When you stop to think about how Batman had anything to do ' +
  'with this, you would get nowhere fast.';

When programmatically building up a string, use Array#join instead of string concatenation.

var items;
var messages;

messages = [{
  state: 'success',
  message: 'This one worked.'
}, {
  state: 'success',
  message: 'This one worked as well.'
}, {
  state: 'error',
  message: 'This one did not work.'
}];

// bad
function inbox(messages) {
  items = '<ul>';
  for (var i = 0; i < messages.length; ++i) {
    items += '<li>' + messages[i].message + '</li>';
  }
  return items + '</ul>';
}

// good
function inbox(messages) {
  items = '<ul>';
  messages.forEach(function (message) {
    items += '<li>' + message.message + '</li>';
  });
  return items + '</ul>';
}

// better
function inbox(messages) {
  return '<ul><li>' + messages.map(function (message) {
    return message.message;
  }).join('</li><li>') + '</li></ul>';
}

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Functions

Function expressions:

// anonymous function expression
var anonymous = function () {
  return true;
};

// named function expression
var named = function named() {
  return true;
};

// immediately-invoked function expression (IIFE)
(function() {
  console.log('Welcome to the Internet. Please follow me.');
})();

Never declare a function in a non-function block (if, while, etc). Assign the function to a variable instead.

// bad
if (currentUser) {
  function test() {
    console.log('Nope.');
  }
}

// good
var test;
if (currentUser) {
  test = function test() {
    console.log('Yup.');
  };
}

Never name a parameter arguments, this will take precedence over the arguments object that is given to every function scope.

// bad
function nope(name, arguments) {
  // ...stuff...
}

// good
function yup(name, args) {
  // ...stuff...
}

Function should never have more than 5 lines of code.

The idea behind this one is to limit the function responsiblities. and it's easier to test the code
Function should have at the most 3 arguments

if you are passing more chances are that you need to pass an object

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Properties

Use dot notation when accessing properties.

var luke = {
  jedi: true,
  age: 28
};

// bad
var isJedi = luke['jedi'];

// good
var isJedi = luke.jedi;

Use subscript notation [] when accessing properties with a variable.

var luke = {
  jedi: true,
  age: 28
};
function getProp(prop) {
  return luke[prop];
}

var isJedi = getProp('jedi');

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Variables

Always use var to declare variables. Not doing so will result in global variables. We want to avoid polluting the global namespace. Captain Planet warned us of that. As mentioned in the General rules section you should always use strict mode. So the this action will raise an error.
```
// bad
superPower = new SuperPower();

// good
var superPower = new SuperPower();
```

Declare each variable on a newline, with a var before each of them.

// bad
 var items = getItems(),
      goSportsTeam = true,
      dragonball = 'z';

// good
 var items = getItems();
 var goSportsTeam = true;
 var dragonball = 'z';

If there are too many declartions in a function, chances are the functions is to big and has too many resposiblities

Declare unassigned variables last. This is helpful when later on you might need to assign a variable depending on one of the previous assigned variables.

// bad
var i;
var items = getItems();
var dragonball;
var goSportsTeam = true;
var len;

// good
var items = getItems();
var goSportsTeam = true;
var dragonball;
var length;
var i;

Avoid redundant variable names, use Object instead.

// bad
var kaleidoscopeName = '..';
var kaleidoscopeLens = [];
var kaleidoscopeColors = [];

// good
var kaleidoscope = {
  name: '..',
  lens: [],
  colors: []
};

Assign variables at the top of their scope. This helps avoid issues with variable declaration and assignment hoisting related issues.

// bad
function() {
  test();
  console.log('doing stuff..');
  //..other stuff..
  var name = getName();
  if (name === 'test') {
    return false;
  }
  return name;
}

// good
function() {
  var name = getName();
  test();
  console.log('doing stuff..');
  //..other stuff..
  if (name === 'test') {
    return false;
  }
  return name;
}

An exception can be made, if you are using a guard statement

// bad
function() {
  var name = getName();
  if (!arguments.length) {
    return false;
  }
  return true;
}

// good
function() {
  if (!arguments.length) {
    return false;
  }
  var name = getName();
  return true;
}

Callbacks

Promises over callbacks, but if you do have them. follow rules mentioned below
Always check for errors in callbacks. in node.js first argument of a callback will be an error object

//bad
database.get('pokemons', function(err, pokemons) {
  console.log(pokemons);
});

//good
database.get('drabonballs', function(err, drabonballs) {
  if (err) {
    // handle the error somehow, maybe return with a callback
    return console.log(err);
  }
  console.log(drabonballs);
});

Return on callbacks

//bad
database.get('drabonballs', function(err, drabonballs) {
  if (err) {
    // if not return here
    console.log(err);
  }
  // this line will be executed as well
  console.log(drabonballs);
});

//good
database.get('drabonballs', function(err, drabonballs) {
  if (err) {
    // handle the error somehow, maybe return with a callback
    return console.log(err);
  }
  console.log(drabonballs);
});

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Try catch

only throw in synchronous functions

Try-catch blocks cannot be used to wrap async code. They will bubble up to to the top, and bring down the entire process.

//bad
function readPackageJson (callback) {
  fs.readFile('package.json', function(err, file) {
    if (err) {
      throw err;
    }
    ...
  });
}
//good
function readPackageJson (callback) {
  fs.readFile('package.json', function(err, file) {
    if (err) {
      return  callback(err);
    }
    ...
  });
}

in synchronus function the try..catch causes problems. mainly due the fact that this function cannot be optimized. Nontheless, sometimes this cannot be avoided, but the damage can be minized

// bad
var parseJson = function parseJson(string) {
  var data;
  try {
    data = JSON.parse(string);
  } catch (e) {
    return console.error('Invalid JSON string');
  }
  // do something with the 'data'
  // ...
}

// good
var tryCatch = function tryCatch(fn, ctx, args) {
  try {
    return fn.apply(ctx, args);
  } catch (e) {
    return e;
  }
}

var parseJson = function parseJson(string) {
  var data = tryCatch(JSON.parse, null, [string]);
  if (data instanceof Error) {
    return console.error('Invalid JSON string');
  }
  // do something with the 'data'
  // ...
}

the tryCatch function contains the part of the code that's not optimized, this allows parseJson function to be optimized.

with lodash

// better

var _ = require('lodash');

var parseJson = function parseJson(string) {
  var data = _.attempt(JSON.parse.bind(null, str));
  if (_.isError(data)) {
    return console.error('Invalid JSON string');
  }
  // do something with the 'data'
  // ...
}

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Conditional Expressions & Equality

Use === and !== over == and != with one exception.
```
  var obj = { foo: true };
  if (obj.foo != null) {
    console.log('obj has foo prop');
  }

  if (obj.bar == null) {
    console.log('obj prop bar is null or undefined');
  }
```
somtimes we may want to know if the value is acutally null or undefined but most of the times those neither of those values are acceptable. so no need to write explicitly obj.bar === null && obj.bar === undefined
don't build complicated conditinals it's hard to follow them, consider wrapping some condtions into a single function

// bad
if (user1.hasHand() && user1.isFriendlyTwords(user2) && user2.hasHand() && user2.isFriendlyTwords(user1)) {
  user1.greets(user2);
  user2.greets(user1);
}

// good
if (user1.wantsToShakeHandWith(user2) && user2.wantsToShakeHandWith(user1)) {
  user1.greets(user2);
  user2.greets(user1);
}

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Comments

Use /** ... */ for multiline comments. Include a description, specify types and values for all parameters and return values.

// bad
// make() returns a new element
// based on the passed in tag name
//
// @param <String> tag
// @return <Element> element
function make(tag) {

  // ...stuff...

  return element;
}

// good
/**
 * make() returns a new element
 * based on the passed in tag name
 *
 * @param <String> tag
 * @return <Element> element
 */
function make(tag) {

  // ...stuff...

  return element;
}

Never comment out a piece of code. If it's commented out then it's not needed. Just delete it.
Don't use comments to explain a functionality. If the code is to hard to understand and it's confusing you should refactor it.

Avoid unnecesary or pointless comments f.e.

// declaring `total` variable and setting it to 0
var total = 0;

//....

// logging into the console the acumulated `total` value
console.log(total);

Do not use // FIXME: to annotate problems

function Calculator() {

  // FIXME: shouldn't use a global here
  total = 0;

  return this;
}

if there is a problem, fix it, don't leave it for later.

Do not use // TODO: to annotate solutions to problems
```
function Calculator() {

  // TODO: total should be configurable by an options param
  this.total = 0;

  return this;
}
```
if there is something that you think will improve the code base do it. don't leave it for later. chances are that you will never do it and the comment will be there forever.

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Type Casting & Coercion

Perform type coercion at the beginning of the statement.

Strings:

//  => this.reviewScore = 9;

// bad
var totalScore = this.reviewScore + '';

// good
var totalScore = '' + this.reviewScore;

// bad
var totalScore = '' + this.reviewScore + ' total score';

// good
var totalScore = this.reviewScore + ' total score';

Use parseInt for Numbers and always with a radix for type casting.

var inputValue = '4';

// bad
var val = new Number(inputValue);

// bad
var val = +inputValue;

// bad
var val = inputValue >> 0;

// bad
var val = parseInt(inputValue);

// good
var val = Number(inputValue);

// good
var val = parseInt(inputValue, 10);

If for whatever reason you are doing something wild and parseInt is your bottleneck and need to use Bitshift for performance reasons
Note: Be careful when using bitshift operations. Numbers are represented as 64-bit values, but Bitshift operations always return a 32-bit integer (source). Bitshift can lead to unexpected behavior for integer values larger than 32 bits. Discussion. Largest signed 32-bit Int is 2,147,483,647:
```
2147483647 >> 0 //=> 2147483647
2147483648 >> 0 //=> -2147483648
2147483649 >> 0 //=> -2147483647
```

Booleans:

var age = 0;

// bad
var hasAge = new Boolean(age);

// good
var hasAge = Boolean(age);

// good
var hasAge = !!age;

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Naming Conventions

Use readable synonyms in place of reserved words.

// bad
var superman = {
  class: 'alien'
};

// bad
var superman = {
  klass: 'alien'
};

// good
var superman = {
  type: 'alien'
};

Avoid single letter names. Be descriptive with your naming.

// bad
function q() {
  // ...stuff...
}

// good
function query() {
  // ..stuff..
}

Use camelCase when naming objects, functions, and instances

// bad
var OBJEcttsssss = {};
var this_is_my_object = {};
function c() {}
var u = new user({
  name: 'Bob Parr'
});

// good
var thisIsMyObject = {};
function thisIsMyFunction() {}
var user = new User({
  name: 'Bob Parr'
});

Use PascalCase when naming constructors or classes

// bad
function user(options) {
  this.name = options.name;
}

var bad = new user({
  name: 'nope'
});

// good
function User(options) {
  this.name = options.name;
}

var good = new User({
  name: 'yup'
});

Use a leading underscore _ when naming private properties

// bad
this.__firstName__ = 'Panda';
this.firstName_ = 'Panda';

// good
this._firstName = 'Panda';

When saving a reference to this use _this.

// bad
function() {
  var self = this;
  return function() {
    console.log(self);
  };
}

// bad
function() {
  var that = this;
  return function() {
    console.log(that);
  };
}

// good
function() {
  var _this = this;
  return function() {
    console.log(_this);
  };
}

Name your functions. This is helpful for stack traces.

// bad
var log = function(msg) {
  console.log(msg);
};

// good
var log = function log(msg) {
  console.log(msg);
};

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Accessors

Accessor functions for properties are not required

If you do make accessor functions use getVal() and setVal('hello')

// bad
dragon.age();

// good
dragon.getAge();

// bad
dragon.age(25);

// good
dragon.setAge(25);

If the property is a boolean, use isVal() or hasVal()

// bad
if (!dragon.age()) {
  return false;
}

// good
if (!dragon.hasAge()) {
  return false;
}

It's okay to create get() and set() functions, but be consistent.

function Jedi(options) {
  options || (options = {});
  var lightsaber = options.lightsaber || 'blue';
  this.set('lightsaber', lightsaber);
}

Jedi.prototype.set = function(key, val) {
  this[key] = val;
};

Jedi.prototype.get = function(key) {
  return this[key];
};

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Constructors

Assign methods to the prototype object, instead of overwriting the prototype with a new object. Overwriting the prototype makes inheritance impossible: by resetting the prototype you'll overwrite the base!

function Jedi() {
  console.log('new jedi');
}

// bad
Jedi.prototype = {
  fight: function fight() {
    console.log('fighting');
  },

  block: function block() {
    console.log('blocking');
  }
};

// good
Jedi.prototype.fight = function fight() {
  console.log('fighting');
};

Jedi.prototype.block = function block() {
  console.log('blocking');
};

Methods can return this to help with method chaining.

// bad
Jedi.prototype.jump = function() {
  this.jumping = true;
  return true;
};

Jedi.prototype.setHeight = function(height) {
  this.height = height;
};

var luke = new Jedi();
luke.jump(); // => true
luke.setHeight(20) // => undefined

// good
Jedi.prototype.jump = function() {
  this.jumping = true;
  return this;
};

Jedi.prototype.setHeight = function(height) {
  this.height = height;
  return this;
};

var luke = new Jedi();

luke.jump()
  .setHeight(20);

It's okay to write a custom toString() method, just make sure it works successfully and causes no side effects.

function Jedi(options) {
  options || (options = {});
  this.name = options.name || 'no name';
}

Jedi.prototype.getName = function getName() {
  return this.name;
};

Jedi.prototype.toString = function toString() {
  return 'Jedi - ' + this.getName();
};

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License

(The MIT License)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Reference

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