JavaScript Fundamentals Every Beginner Should Know

JavaScript Fundamentals Every Beginner Should Know

We are going to learn various Javascript fundamentals that every javascript developer should know. This blog is basically for any JavaScript beginners. JavaScript is an interpreted language.

Introduction

We are going to learn various Javascript fundamentals that every javascript developer should know. This blog is basically for any JavaScript beginners. JavaScript is an interpreted language.

JavaScript Fundamentals

Moving forward, let’s see, what are the JavaScript fundamentals. These are:

  • In JavaScript, everything is an Object.
  • JavaScript is Case Sensitive. FirstName and Firstname, are two different variables.
  • Learn how to declare and assign values of variables.
  • Learn the difference between Value Types and Reference Types, and how to assign values to them.
  • Understand the difference between == and === in JavaScript.
  • Learn about JavaScript Type Operators. typeof and instanceof are two type operators.
  • Understand the difference between Undefined and Null.
  • Learn about Primitive and Complex Data in JavaScript.
  • Understand Functions, function invocation, passing and returning values in and out from them.
  • Learn different types of Operators in JavaScript. These are Arithmetic, Assignment, String, Comparison, Logical, Type and Bitwise operators.
  • Understand JavaScript Objects. Learn Object Definition, Object Properties, Accessing Object Properties, and Object Methods.
  • Learn about implicit typing, explicit typing, nominal typing, structural and duck typing.
  • Understand the this keyword in JavaScript.
  • Learn about JavaScript Array. Understand how to create them and use them. Learn about different types of Array Properties and Methods.
  • Understand JavaScript Array Iteration Methods. Learn about these methods:
  1. Array.forEach(): forEach() method calls a function once for each array element.
  2. Array.map(): map() method creates a new array by performing a function on each array element.
  3. Array.filter(): filter() method creates a new array with array elements that passes a test.
  4. Array.reduce(): reduce() method runs a function on each array element to produce (reduce it to) a single value.
  5. Array.reduceRight(): reduceRight() method runs a function on each array element to produce (reduce it to) to a single value.
  6. Array.every(): every() method checks if all array values pass a test.
  7. Array.some(): some() method checks if some array values pass a test.
  8. Array.indexOf(): indexOf() search an array for an element value and returns its position.
  9. Array.lastIndexOf(): lastIndexOf() is the same as indexOf(), but searches from the end of the array.
  10. Array.find(): find() method returns the value of the first array element that passes a test function.
  11. Array.findIndex(): findIndex() method returns the index of the first array element that passes a test function.
  • Understand JavaScript Dates. Learn different kinds of Dates formats. Understand Get & Set Date methods.
  • Understand different kinds of Loops in JavaScript. These are the loops:

forfor/inwhile and do/while

  • Understand JavaScript Function Scope. Learn about Local Scope and Global Scope.
  • Understand JavaScript Hoisting. This is the JavaScript’s default behavior of moving any declaration on the top.
  • Understand what is “use strict“.

Summary

So, in this blog, we learned about few basics things that a JavaScript beginner should know. These are very fundamental concepts of JavaScript.


By : Adesh



javascript

Bootstrap 5 Complete Course with Examples

Bootstrap 5 Tutorial - Bootstrap 5 Crash Course for Beginners

Nest.JS Tutorial for Beginners

Hello Vue 3: A First Look at Vue 3 and the Composition API

Building a simple Applications with Vue 3

Deno Crash Course: Explore Deno and Create a full REST API with Deno

How to Build a Real-time Chat App with Deno and WebSockets

Convert HTML to Markdown Online

HTML entity encoder decoder Online

The essential JavaScript concepts that you should understand

The essential JavaScript concepts that you should understand - For successful developing and to pass a work interview

JavaScript Memory Management System

The main goal of this article is help to readers to understand that how memory management system performs in JavaScript. I will use a shorthand such as GC which means Garbage Collection. When the browsers use Javascript, they need any memory location to store objects, functions, and all other things. Let’s deep in dive that how things going to work in GC.

Grokking Call(), Apply() and Bind() Methods in JavaScript

In this article, we will have a look at the call(), apply() and bind() methods of JavaScript. Basically these 3 methods are used to control the invocation of the function.

A quick guide to JavaScript Arrays

6 most commonly used methods and how they’re implemented. Arrays are a structure common to all programming languages so knowing what they are and having a firm grasp on what you’re able to accomplish with Arrays will take you a long way in your journey as a software developer.

JavaScript Tutorial: if-else Statement in JavaScript

This JavaScript tutorial is a step by step guide on JavaScript If Else Statements. Learn how to use If Else in javascript and also JavaScript If Else Statements. if-else Statement in JavaScript. JavaScript's conditional statements: if; if-else; nested-if; if-else-if. These statements allow you to control the flow of your program's execution based upon conditions known only during run time.