Thursday, July 6, 2017

Important JavaScript Features, Tools and Libraries to Blow Your Mind

JavaScript is a browser-based language used for adding interactivity to web pages and it has evolved extremely over the past few years. The language was first implemented by Netscape Communications Corp. in Netscape Navigator 2 beta (1995). 
It can be used to improve HTML pages and is easily embedded in HTML code. It is an interpreted language and it doesn't need to be compiled. JavaScript renders web pages in an interactive and dynamic fashion. This allowing the pages to react to events, exhibit special effects, accept variable text, validate data, create cookies, detect a user’s browser, etc.

Let’s have a look at some of the important JavaScript tips, tricks and tools. These can be some great web design inspirations.

1. Write JavaScript today with Babel
Not all browsers understand ES2015 code yet, so in order to use the latest features of the language today, many people use a tool like Babel. This transforms ES2015 code into normal ES5 JavaScript code which all browsers can interpret. It is pretty common for developers to include Babel in their deployment process through build systems such as gulp or webpack. 
2. New methods of declaring variables
JavaScript has introduced two new ways of declaring variables: let and const. let is used when a variable will be reassigned, whereas const keeps a variable from being reassigned.
  • The main advantage of using both let and const over var is that when using var variables get scoped to the top of the current function, therefore making the variable available to the whole function.
  • In contrast, let and const are scoped to their closest block, allowing developers to declare variables within if, while, for and even switch blocks, without worrying about the variable scope leaking outside of that context.
3. Use arrow functions to keep 'this' intact
Another important feature added to JavaScript is arrow functions. These have the ability to keep this context intact, especially when using it within callbacks that might get called from somewhere else (i.e. adding an event listener with jQuery, and so on). Arrow functions can replace the need to add .bind(this) at the end of a function declaration.

There are two main ways of writing arrow functions:
  • one-liners
  • multiple-liners.
One-liners have only one expression and return value of that given expression, without the need for curly braces.
Whereas Multiple-liners, on the other hand, have curly braces and the return keyword will be used explicitly.

4. Replace 'for' loops with 'map' 
Let’s say we have an array of numbers and we want to produce another array by doubling all of the numbers from the first array. One method is to do by declaring an empty array, write a for loop, and set a number in the second array by looking up the index on the first array and doubling it.
We can use a more concise solution by mapping an array to another array:
[1, 2, 3].map((num) => num * 2); // [2, 4, 6]

5. Replace 'for' loops with 'filter'
Let’s suppose we have an array of numbers and we want to produce another array containing only even numbers from the first array. One way of doing this would be to declare an empty array, write a for loop, and write an if statement to check if the number at the index is even.
For example, we could use the filter method available for arrays:
[4, 7, 2, 3].filter((num) => num % 2 === 0); // [4, 2]

6. Redux: State of management for all

One of the hardest parts of writing apps with highly dynamic user interfaces is keeping up with the application’s state. This is the problem the Redux library addresses. Redux is commonly used alongside React and is slowly being adopted by the Angular community. It helps in writing applications which behaves consistently and it offers a great developer experience. So, in case if you are writing an app that might become very large, one must consider using Redeloper tool offerings. We will see more live programming features come online as the JavaScript moves deeper into unified applicationux.

JavaScript contains the richest array of developer tools that can be seen for any language. In the future, we might see additional consistent integrated dev
state and immutability.

The best way to learn important concepts related to JavaScript features is by joining a professional web development institute in Delhi which can offer diploma and certificate courses in web.

No comments:

Post a Comment