Hugo JS

Hugo JS

1595376540

Top 30 JavaScript Concepts You Need to Master to Become an Expert

You’ll hear many people complaining that JavaScript is weird and sometimes worthless. People complain like this because they don’t understand how things work under the hood. Although I do agree that some scenarios in JavaScript are handled differently, that does not make it weird but rather beautiful in its own way.

To start loving a programming language, you should start by looking deep within and mastering its concepts one by one.

Here is a list of 36 JavaScript concepts that you need to master to become an all-round JavaScript expert.

Although this piece is one of my longest, I assure you that it is worthy of your time. Kudos to Stephen and Leonardo for the resources.

The resources section contains a link to the GitHub repo by Leonardo which contains learning material for all these concepts explained below. Please take your time in understanding each of the below-mentioned concepts.

1. Call Stack Execution

Everyone will have heard of the website Stack Overflow. But are you aware of the actual stack overflow? Stack overflow is an error associated with the operations of the call stack.

By understanding the call stack, you will have a working knowledge of how a high-level language like JavaScript gets executed.

2. Primitive Data Types

const foo = "bar";
foo.length; // 3
foo === "bar"; // true

Wait!

When you assign the value bar to the constant foo, it is of the primitive type string. That’s acceptable for everyone. But how can you access the property length of a primitive string?

Weird? Nah.

This feature is called autoboxing. In the above example, JavaScript wraps the constant in a temporary wrapper object and then accesses the length property of that object. Once this step is complete, the object is safely discarded.

By having a deep knowledge of the primitive data types, you will know how they are stored in memory up until the point of their binary representation. You will also know how these “weird” situations occur and the logical reason behind them.

3. Value Types and Reference Types

I recently had some confusion over how the concept “pass by reference” works in JavaScript. Although I was aware of the concepts “pass by reference” and “pass by value” in languages such as C and Java, I was not sure how it worked in JavaScript.

Did you know that variables assigned to non-primitive values in JavaScript are given a reference to that value? The reference points to the memory location where the value is stored.

var arr1 = [1,2,3];

var arr2 = arr1;
arr2.push(10);
console.log(arr2);
//[1, 2, 3, 10]
console.log(arr1);
//[1, 2, 3, 10]

As you can see from the above example, any modifications done to arr2 will be reflected on arr1 as well. This is because they only hold the reference to the value, not the actual value itself.

By understanding this concept of value types and reference types, you will have a better understanding of how variables are assigned with values and memory references.

#angular #javascript #react #programming #nodejs

What is GEEK

Buddha Community

Top 30 JavaScript Concepts You Need to Master to Become an Expert

Jonathan G

1595439921

Nice list.

Shamim Khaaan

1597251554

d3 online course plzz sird3

Hugo JS

Hugo JS

1595376540

Top 30 JavaScript Concepts You Need to Master to Become an Expert

You’ll hear many people complaining that JavaScript is weird and sometimes worthless. People complain like this because they don’t understand how things work under the hood. Although I do agree that some scenarios in JavaScript are handled differently, that does not make it weird but rather beautiful in its own way.

To start loving a programming language, you should start by looking deep within and mastering its concepts one by one.

Here is a list of 36 JavaScript concepts that you need to master to become an all-round JavaScript expert.

Although this piece is one of my longest, I assure you that it is worthy of your time. Kudos to Stephen and Leonardo for the resources.

The resources section contains a link to the GitHub repo by Leonardo which contains learning material for all these concepts explained below. Please take your time in understanding each of the below-mentioned concepts.

1. Call Stack Execution

Everyone will have heard of the website Stack Overflow. But are you aware of the actual stack overflow? Stack overflow is an error associated with the operations of the call stack.

By understanding the call stack, you will have a working knowledge of how a high-level language like JavaScript gets executed.

2. Primitive Data Types

const foo = "bar";
foo.length; // 3
foo === "bar"; // true

Wait!

When you assign the value bar to the constant foo, it is of the primitive type string. That’s acceptable for everyone. But how can you access the property length of a primitive string?

Weird? Nah.

This feature is called autoboxing. In the above example, JavaScript wraps the constant in a temporary wrapper object and then accesses the length property of that object. Once this step is complete, the object is safely discarded.

By having a deep knowledge of the primitive data types, you will know how they are stored in memory up until the point of their binary representation. You will also know how these “weird” situations occur and the logical reason behind them.

3. Value Types and Reference Types

I recently had some confusion over how the concept “pass by reference” works in JavaScript. Although I was aware of the concepts “pass by reference” and “pass by value” in languages such as C and Java, I was not sure how it worked in JavaScript.

Did you know that variables assigned to non-primitive values in JavaScript are given a reference to that value? The reference points to the memory location where the value is stored.

var arr1 = [1,2,3];

var arr2 = arr1;
arr2.push(10);
console.log(arr2);
//[1, 2, 3, 10]
console.log(arr1);
//[1, 2, 3, 10]

As you can see from the above example, any modifications done to arr2 will be reflected on arr1 as well. This is because they only hold the reference to the value, not the actual value itself.

By understanding this concept of value types and reference types, you will have a better understanding of how variables are assigned with values and memory references.

#angular #javascript #react #programming #nodejs

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Niraj Kafle

1589255577

The essential JavaScript concepts that you should understand

As a JavaScript developer of any level, you need to understand its foundational concepts and some of the new ideas that help us developing code. In this article, we are going to review 16 basic concepts. So without further ado, let’s get to it.

#javascript-interview #javascript-development #javascript-fundamental #javascript #javascript-tips

Rahul Jangid

1622207074

What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");
</script>

How to comment JavaScript code?

  • For single line comment in JavaScript we have to use // (double slashes)
  • For multiple line comments we have to use / * – – * /
<script type="text/javascript">

//single line comment

/* document.write("Hello"); */

</script>

Advantages and Disadvantages of JavaScript

#javascript #javascript code #javascript hello world #what is javascript #who invented javascript

Ajay Kapoor

1626321063

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