5 Javascript Essentials (You Need to Know Today)

5 Javascript Essentials (You Need to Know Today)

We are looking at the five most essential Javascript fundamentals that one must understand to deal with the intricacies of Javascript. Knowing these five great topics will surely help you write clean and comprehendible Javascript code. 5 Javascript essentials (You need to know today)

We are looking at the five most essential Javascript fundamentals that one must understand to deal with the intricacies of Javascript. Knowing these five great topics will surely help you write clean and comprehendible Javascript code.

1. Closures

2. Hoisting

3. Callback Vs Promise

4. ‘this’ keyword in Javascript

5. Prototypes

callback hoisting javascript

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Understanding Hoisting in JavaScript

In JavaScript, Hoisting is the default behavior where variables and function declarations are moved to the top of their scope before code execution.

Intro to Callback in JavaScript

Foundation of callback function and use cases in JavaScript. In JavaScript, functions are objects, which means, like any other objects it can be assigned to a variable and passed as an argument to another function. In a nutshell, a callback function is _a function_ that is provided as a _parameter_ for other methods such as forEach method or addEventListener method and gets invoked at a certain point in time.

What is Callback-Function in JavaScript? How it is Replaced By Promises?

Let us understand term Callback by an real-world example: Suppose, you are calling to your Girlfriend (If you have) and she is busy in another call then she send message to you : “I am busy right now, Call back you later.!!”. After completing her work, she calls you back and this is what call back in JavaScript as well. In this post, we'll discuss What is Callback-Function in JavaScript? How it is Replaced By Promises?

Variable Hoisting in Javascript

Hoisting is a tricky and very important topic in javascript. Lot of questions asked in javascript interviews are based on hoisting. In this article, we will go through variable hoisting in javascript and see how it affects the desired output.

JavaScript Tutorial - What is Hoisting in JavaScript?

Hoisting is often a misused term that gets thrown away a lot in job interviews and tech conversations, with few truly understanding it. In this post, you'll learn What is Hoisting in JavaScript