Merge pull request #46 from stmoreau/master
JavaScript language Objects section creation
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Julien Le Coupanec
GitHub
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README.md
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README.md
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> ❤️ **If you like this repository, [you can click here to tweet it and make it spread](https://ctt.ec/PHba4).**
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## 🤔 Why Awesome-Cheatsheets?
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I always make a cheatsheet when I want to improve my skills on a programming language, a framework or a development tool. [I started doing these kind of things a long time ago on Gist](https://gist.github.com/LeCoupa) To better keep track of the history and to let people contribute to them, I reorganized everything into this single repository. Most of the content is coming from official documentations and some books I have read.
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I always make a cheatsheet when I want to improve my skills on a programming language, a framework or a development tool. [I started doing these kind of things a long time ago on Gist](https://gist.github.com/LeCoupa) To better keep track of the history and to let people contribute to them, I reorganized everything into this single repository. Most of the content is coming from official documentations and some books I have read.
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Feel free to browse each cheatsheet to learn new things and to keep them at hand when you forgot about one command. They have been designed to provide a quick way to assess your knowledge and to save you time.
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## 📚 Table of Contents
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### 📃 Languages
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#### Functional
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* [JavaScript](languages/javascript.js)
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</details>
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</details>
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### 📦 Backend
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* [Django](backend/django.py)
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#### Javascript
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* [Feathers.js](backend/feathers.js)
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* [Moleculer](backend/moleculer.js)
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* [Node.js](backend/node.js)
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</details>
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</details>
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### 🌐 Frontend
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* [React.js](frontend/react.js)
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* [Vue.js](frontend/vue.js)
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</details>
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</details>
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### 🗃️ Databases
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#### NoSQL
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* [Redis](databases/redis.sh)
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</details>
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</details>
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### 🔧 Tools
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@ -95,14 +90,12 @@ Feel free to browse each cheatsheet to learn new things and to keep them at hand
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* [Kubernetes](tools/kubernetes.sh)
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* [Nanobox Boxfile](tools/nanobox_boxfile.yml)
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* [Nanobox CLI](tools/nanobox_cli.sh)
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</details>
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</details>
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## 🙌🏼 How to Contribute?
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You are more than welcome to contribute and build your own cheatsheet for your favorite programming language, framework or development tool. Just submit changes via pull request and I will review them before merging.
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## 🙏🏻 Contribution
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<table>
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<td align="center">
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<a href="https://learnk8s.io/" target="_blank"><img src="https://pbs.twimg.com/profile_images/925127335573114880/9yCkEIe3_400x400.jpg" height="64" /></a>
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</td>
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<td align="center">
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<a href="https://www.voxygen.com/" target="_blank"><img src="https://imgur.com/XQoVtag.png" height="64" /></a>
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</td>
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</tr>
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</table>
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/* *******************************************************************************************
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* GLOBAL OBJECTS > OBJECT
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* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object
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* ******************************************************************************************* */
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// Global object: properties
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Object.length // length is a property of a function object, and indicates how many arguments the function expects, i.e. the number of formal parameters. This number does not include the rest parameter. Has a value of 1.
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Object.prototype // Represents the Object prototype object and allows to add new properties and methods to all objects of type Object.
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// Methods of the Object constructor
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Object.assign(target, ...sources) // Copies the values of all enumerable own properties from one or more source objects to a target object. method is used to copy the values of all enumerable own properties from one or more source objects to a target object. It will return the target object
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Object.create(MyObject) // Creates a new object with the specified prototype object and properties. The object which should be the prototype of the newly-created object.
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Object.defineProperty(obj, prop, descriptor) // Adds the named property described by a given descriptor to an object.
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Object.defineProperties(obj, props) // Adds the named properties described by the given descriptors to an object.
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Object.entries(obj) // Returns an array containing all of the [key, value] pairs of a given object's own enumerable string properties.
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Object.freeze(obj) // Freezes an object: other code can't delete or change any properties.
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Object.getOwnPropertyDescriptor(obj, prop) // Returns a property descriptor for a named property on an object.
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Object.getOwnPropertyDescriptors(obj) // Returns an object containing all own property descriptors for an object.
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Object.getOwnPropertyNames(obj) // Returns an array containing the names of all of the given object's own enumerable and non-enumerable properties.
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Object.getOwnPropertySymbols(obj) // Returns an array of all symbol properties found directly upon a given object.
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Object.getPrototypeOf(obj) // Returns the prototype of the specified object.
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Object.is(value1, value2); // Compares if two values are the same value. Equates all NaN values (which differs from both Abstract Equality Comparison and Strict Equality Comparison).
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Object.isExtensible(obj) // Determines if extending of an object is allowed.
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Object.isFrozen(obj) // Determines if an object was frozen.
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Object.isSealed(obj) // Determines if an object is sealed.
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Object.keys(obj) // Returns an array containing the names of all of the given object's own enumerable string properties.
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Object.preventExtensions(obj) // Prevents any extensions of an object.
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Object.seal(obj) // Prevents other code from deleting properties of an object.
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Object.setPrototypeOf(obj, prototype) // Sets the prototype (i.e., the internal [[Prototype]] property).
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Object.values(obj) // Returns an array containing the values that correspond to all of a given object's own enumerable string properties.
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// Object instances and Object prototype object (Object.prototype.property or Object.prototype.method())
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// Properties
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obj.constructor // Specifies the function that creates an object's prototype.
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obj.__proto__ // Points to the object which was used as prototype when the object was instantiated.
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// Methods
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obj.hasOwnProperty(prop) // Returns a boolean indicating whether an object contains the specified property as a direct property of that object and not inherited through the prototype chain.
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prototypeObj.isPrototypeOf(object) // Returns a boolean indicating whether the object this method is called upon is in the prototype chain of the specified object.
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obj.propertyIsEnumerable(prop) // Returns a boolean indicating if the internal ECMAScript [[Enumerable]] attribute is set.
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obj.toLocaleString() // Calls toString().
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obj.toString() // Returns a string representation of the object.
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object.valueOf() // Returns the primitive value of the specified object.
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/* *******************************************************************************************
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* GLOBAL OBJECTS > ARRAY
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* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array
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* ******************************************************************************************* */
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// Global object: properties
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Array.length // Reflects the number of elements in an array.
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Array.prototype // Represents the prototype for the Array constructor and allows to add new properties and methods to all Array objects.
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