What is Javascript?
- Javascript is a scripting language that we can use on both, client side as well as on the server side and that allows you to make web pages interactive.
- It is an interpreted programming language with object-oriented capabilities.
- It was first known as LiveScript, but Netscape changed its name to JavaScript, possibly because of the excitement being generated by Java.
Why is it important to learn Javascript?
- JavaScript is the most popular programming language used by professional developers today. Even back-end developers choose JavaScript more often.
- It is lightweight and most commonly used as a part of web pages, whose implementations allow client-side script to interact with the user and make dynamic pages.
- It can also create different kinds of software such as games, computer programs, web applications, and even technologies like blockchain.
Javascript Roadmap
- Variables
- var keyword is used to declare variables since JavaScript was created. It is confusing and error-prone when using variables declared using
var. - let keyword removes the confusion and error of
var. It is the new and recommended way of declaring variables in JavaScript. - const keyword is used to declare a constant variable that cannot be changed once assigned a value. READ MORE >
- Classes
Classes are a template for creating objects. They are built on prototypes but also have some syntax and semantics that are unique to classes.
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- Comparison and Logical Operators
Comparison and Logical operators are the operators which will test whether the condition will be TRUE or FALSE.
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- Loops and Iteration
- Functions
A JavaScript function is a block of code designed to perform a particular task. It will get executed when something invokes it (calls it).
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- Event loop
JavaScript has a runtime model based on an Event loop, which is responsible for executing the code, collecting and processing events, and executing queued sub-tasks.
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- Document Object Model (DOM)
The Document Object Model is a programming interface for web documents. It represents the page so that programs can change the document structure, style, and content. DOM represents the document as nodes and objects; that way, programming languages can interact with the page.
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- Array Methods
- Object Methods
- Hoisting
Hoisting refers to the process whereby the interpreter appears to move the declaration of functions, variables or classes to the top of their scope, prior to execution of the code.
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- Closure
Closure is the combination of a function bundled together (enclosed) with references to its surrounding state (the lexical environment). In other words, a closure gives you access to an outer function’s scope from an inner function.
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- Callback, Promises, async/await
Callback is a function that is passed inside another function, and then called in that function to perform a task.
Promises are used to handle asynchronous operations in JS.
The async keyword represent that the function is an asynchronous function and the await keyword is used inside the async function to wait for the asynchronous operation.
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- Error Handling
JavaScript provides error-handling mechanism to catch runtime errors using try-catch-finally block, similar to other languages like Java or C#.
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- If you want to learn Javascript, Above are the key points which will help you to grow more in your career.
- Also, If you like this post or have any queries, Do let me know in the comments.
- Below are the resources to learn more about Javascript.
