JavaScript Best Practices — Unary Operators, and Useless Expressions

To make code easy to read and maintain, we should follow some best practices.

In this article, we’ll look at some best practices we should follow to make everyone’s lives easier.

Unary Operators ++ and --

++ and -- both do assignment and return the value.

Their placement can change the meaning of the code.

So, we should consider using alternatives.

For instance, instead of writing:

let i = 10;
i++;

We write:

let i = 10;
i += 1;

Use of process.env

We may use configurations instead of setting environment variables.

They’re easy to replace.

For instance, instead of writing:

if (process.env.NODE_ENV === "development") {
  //...
}

We write:

const config = require("./config");

if (config.env === "development") {
  //...
}

No process.exit()

process.exit() ends the program immediately.

This means that we don’t have a chance to handle errors gracefully.

So instead of writing:

if (error) {
  process.exit(1);
}

Instead, we write:

if (error) {
  throw new Error("error happened");
}

No Use of __proto__

__proto__ is a hidden property of an object which has its prototype.

We should use Object.setPrototypeOf and Object.getPrototypeOf to set and get the prototype of an object respectively.

For instance, instead of writing:

const a = obj.__proto__;

obj.__proto__ = b;

We write:

const a = Object.getPrototypeOf(obj);

Object.setPrototypeOf(obj, b);

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JavaScript compound assignment operators

JavaScript is unarguablly one of the most common things you’ll learn when you start programming for the web. Here’s a small post on JavaScript compound assignment operators and how we use them.

The compound assignment operators consist of a binary operator and the simple assignment operator.

The binary operators, work with two operands. For example a+b where + is the operator and the a, b are operands. Simple assignment operator is used to assign values to a variable(s).

It’s quite common to modify values stored in variables. To make this process a little quicker, we use compound assignment operators.

They are:

• +=
• -+
• *=
• /=

You can also check my video tutorial compound assignment operators.

Let’s consider an example. Suppose price = 5 and we want to add ten more to it.

var price = 5;
price = price + 10;

We added ten to price. Look at the repetitive price variable. We could easily use a compound += to reduce this. We do this instead.

price += 5;

Awesome. Isn’t it? What’s the value of price now? Practice and comment below. If you don’t know how to practice check these lessons.

Lets bring down the price by 5 again and display it.
We use console.log command to display what is stored in the variable. It is very help for debugging.
Debugging let’s you find errors or bugs in your code. More on this later.

price -= 5;
console.log(price);

Lets multiply price and show it.

price *=5;
console.log(price);

and finally we will divide it.

price /=5;
console.log(price);

If you have any doubts, comment below.

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JavaScript Best Practices — Unary Operators, and Useless Expressions

To make code easy to read and maintain, we should follow some best practices.

In this article, we’ll look at some best practices we should follow to make everyone’s lives easier.

Unary Operators ++ and --

++ and -- both do assignment and return the value.

Their placement can change the meaning of the code.

So, we should consider using alternatives.

For instance, instead of writing:

let i = 10;
i++;

We write:

let i = 10;
i += 1;

Use of process.env

We may use configurations instead of setting environment variables.

They’re easy to replace.

For instance, instead of writing:

if (process.env.NODE_ENV === "development") {
  //...
}

We write:

const config = require("./config");

if (config.env === "development") {
  //...
}

No process.exit()

process.exit() ends the program immediately.

This means that we don’t have a chance to handle errors gracefully.

So instead of writing:

if (error) {
  process.exit(1);
}

Instead, we write:

if (error) {
  throw new Error("error happened");
}

No Use of __proto__

__proto__ is a hidden property of an object which has its prototype.

We should use Object.setPrototypeOf and Object.getPrototypeOf to set and get the prototype of an object respectively.

For instance, instead of writing:

const a = obj.__proto__;

obj.__proto__ = b;

We write:

const a = Object.getPrototypeOf(obj);

Object.setPrototypeOf(obj, b);

#web-development #technology #programming #software-development #javascript

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

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