generator is a function which behaves like an iterator. It can stop, and resume from where it stopped earlier
Default parameters are parameters which permit named parameters to start with default values if no value or undefined passes.
Class Expressions mean to define a class in ES6. Class expression are named and unnamed, both. It uses prototype-based inheritance.
Difference between CofeeScript and ES6:
There is no exclusive difference between ES6 and Typescript. You can perform functions in ES6 which you can perform in Typescript. Only difference is that transcript can create ECMAScript only.
yes, ES6 will support Backend.
Thus, the key aim of Prototypal Inheritance makes an object point towards some other object and assume entirely its properties. This allows various specifications of a targeted object to allocate familiar properties.
const: It is used to create an immutable variable. Immutable variables are variables whose value is never changed in the complete life cycle of the program.
let: let is used to create a mutable variable. Mutable variables are normal variables like var that can be changed any number of time.
this.name = name;
this.age = age;
console.log(this.name + " is " + this.age + " years old !");
var user = new User("foo", 7);
Destructing assignment in another improvement in Es6. It allows us to extract data from array and objects into separate variables.
let full_name =['John','Deo'];
// outputs John Deo
// outputs 100 [200, 330, 400]
Installation: In order to install Babel, you require node.js and NPM. Make sure Node.js is installed on your server.
To check node installed or not run below commands on your terminal.
Installing Babel : We can install Babel CLI locally by running below command on terminal.
npm install --save-dev babel-cli
Class- You can use the patterns easily with OOP based class declaration. It works readily with constructors, supports base class access, inheritance and static methods. OOP refers to Object-Oriented Programming.
Proxies- With proxies, you get to create objects and you can host the objects with a huge behavior diversity. Proxies can help in profiling and logging as well.
Spread Operator- Donated by ‘...’ and is followed by the variable. The syntax of the spread operator would look like this for example:- ‘...X’. Spread operators manipulated objects and arrays which is the prime reason it is used in ES6. It is used for copying the property of one object to another.
Default Operator- In order to initialize a function using default values, the default operator is deployed. The parameter’s value can be anything- a number or a function or null.
Rest Parameter- This operator is used for recovering all the arguments that are required to invoke a function. This allows us to put items belonging to different categories separate. The rest parameter allows combining the parameters in a common array parameter.
ES6 classes have been found to be very useful to the developers. Some of the major uses of ES6 classes are as follows:
ES6 classes have a simpler and less error-prone syntax.
As far as setting up inheritance hierarchies are concerned, ES6 is considered as the best option as it uses new syntax with the old syntax which minimizes the errors and eases the process.
ES6 classes help in defending the developers from failing to use new ones properly with the constructor function. This is one of the most common errors that occur with the developers during the use of a new operator. Classes remove this error by having the constructor throw an exception if this proves to be an invalid object for the constructor.
Classes also help to call the method which is of the prototype’s version. This version is much simpler with the new ES6 syntax than the old versions.
Destructuring assignment is a special syntax that allows you to "unpack" arrays or objects into a bunch of variables, as sometimes they are more convenient.
* Simple Destructuring
* Assign default value while destructuring
* Adding an Alias to a Destructured Assignment
* Adding an Alias to a Destructured Assignment
1. Collation: It is a method for searching and sorting strings within a collection. It has a locale argument and is Unicode-aware.
2. Number Formatting: Localized separators and digit grouping can be used to format numbers. Style formatting, numeral system, percent, and precision are among the other items.
3. Currency formatting: Currency symbols, localized separators, and digit grouping are the most common ways to format numbers.
4. Date and time formatting: Localized separators and ordering are used for formatting. The format can be short or long, and other characteristics such as location and time zone can be included.
There are four string methods introduced in ES6 that are listed as follows: