18 Tips For Writing JavaScript Code Like A Hero

The complete guide for improving your awesome code

During my years of programming, I always prioritized the way to write the code, not only so that it is clean but also because it helps the speed of processing and it is faster to write it.

It is not the same to write 1000 lines of code than 300, this helps a lot to the program or script that we are doing.

You have to be very careful when programming, because in large projects having “dirty” code can be a serious problem.

Many programmers criticize the JavaScript language for not having a standard way of working like Java or C ++ for example but the truth is that Javascript is one of the best languages that are being used in these times, some of them are Facebook and Netflix. Libraries like React among others improve Front-end performance and as for the backend, nextJs is used for greater speed, these combinations drive today’s programmers crazy.

By learning the following tips you will be able to improve the way you write your code. Take your time and practice with the console to learn well.

Let’s do it! 🔥

18 Tips For Writing JavaScript Code Like A Hero

  • Use ‘const’ for the constants instead of ‘var’
  • Use ‘let’ for the changing variables instead of ‘var’
  • Declaring Objects
  • Declaring Arrays
  • Concatenate strings
  • Use object method shorthand
  • Creating the value of an Object
  • Assign values to an Object
  • Assign a value to an Array
  • Concatenate Arrays
  • Get multiple properties of an object
  • Getting values from an object
  • Creating functions
  • Default values
  • Use ‘reduce’ Instead ‘forEach’ and ‘for’ to sum values
  • Exist in array
  • Shortcut if boolean
  • Shortcut if values

#javascript #programming #web-development #developer #react

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18 Tips For Writing JavaScript Code Like A Hero
Giles  Goodwin

Giles Goodwin

1603857900

4 Ways You Can Get Rid of Dirty Side Effects for Cleaner Code in JavaScript

According to an analysis, a developer creates 70 bugs per 1000 lines of code on average. As a result, he spends 75% of his time on debugging. So sad!

Bugs are born in many ways. Creating side effects is one of them.

Some people say side effects are evil, some say they’re not.

I’m in the first group. Side effects should be considered evil. And we should aim for side effects free code.

Here are 4ways you can use to achieve the goal.

1. use strict;

Just add use strict; to the beginning of your files. This special string will turn your code validation on and prevent you from using variables without declaring them first.

#functional-programming #javascript-tips #clean-code #coding #javascript-development #javascript

Tyrique  Littel

Tyrique Littel

1604008800

Static Code Analysis: What It Is? How to Use It?

Static code analysis refers to the technique of approximating the runtime behavior of a program. In other words, it is the process of predicting the output of a program without actually executing it.

Lately, however, the term “Static Code Analysis” is more commonly used to refer to one of the applications of this technique rather than the technique itself — program comprehension — understanding the program and detecting issues in it (anything from syntax errors to type mismatches, performance hogs likely bugs, security loopholes, etc.). This is the usage we’d be referring to throughout this post.

“The refinement of techniques for the prompt discovery of error serves as well as any other as a hallmark of what we mean by science.”

  • J. Robert Oppenheimer

Outline

We cover a lot of ground in this post. The aim is to build an understanding of static code analysis and to equip you with the basic theory, and the right tools so that you can write analyzers on your own.

We start our journey with laying down the essential parts of the pipeline which a compiler follows to understand what a piece of code does. We learn where to tap points in this pipeline to plug in our analyzers and extract meaningful information. In the latter half, we get our feet wet, and write four such static analyzers, completely from scratch, in Python.

Note that although the ideas here are discussed in light of Python, static code analyzers across all programming languages are carved out along similar lines. We chose Python because of the availability of an easy to use ast module, and wide adoption of the language itself.

How does it all work?

Before a computer can finally “understand” and execute a piece of code, it goes through a series of complicated transformations:

static analysis workflow

As you can see in the diagram (go ahead, zoom it!), the static analyzers feed on the output of these stages. To be able to better understand the static analysis techniques, let’s look at each of these steps in some more detail:

Scanning

The first thing that a compiler does when trying to understand a piece of code is to break it down into smaller chunks, also known as tokens. Tokens are akin to what words are in a language.

A token might consist of either a single character, like (, or literals (like integers, strings, e.g., 7Bob, etc.), or reserved keywords of that language (e.g, def in Python). Characters which do not contribute towards the semantics of a program, like trailing whitespace, comments, etc. are often discarded by the scanner.

Python provides the tokenize module in its standard library to let you play around with tokens:

Python

1

import io

2

import tokenize

3

4

code = b"color = input('Enter your favourite color: ')"

5

6

for token in tokenize.tokenize(io.BytesIO(code).readline):

7

    print(token)

Python

1

TokenInfo(type=62 (ENCODING),  string='utf-8')

2

TokenInfo(type=1  (NAME),      string='color')

3

TokenInfo(type=54 (OP),        string='=')

4

TokenInfo(type=1  (NAME),      string='input')

5

TokenInfo(type=54 (OP),        string='(')

6

TokenInfo(type=3  (STRING),    string="'Enter your favourite color: '")

7

TokenInfo(type=54 (OP),        string=')')

8

TokenInfo(type=4  (NEWLINE),   string='')

9

TokenInfo(type=0  (ENDMARKER), string='')

(Note that for the sake of readability, I’ve omitted a few columns from the result above — metadata like starting index, ending index, a copy of the line on which a token occurs, etc.)

#code quality #code review #static analysis #static code analysis #code analysis #static analysis tools #code review tips #static code analyzer #static code analysis tool #static analyzer

Armando  Bruen

Armando Bruen

1593621572

Who Else Wants to Write Clean JavaScript Code?

Your college: “Who’s the author of this code?”

Expectation: “It’s me!” You answer proudly because that code is beautiful like a princess.

Reality: “Nah, it’s not me!” You lie because that code is ugly like a beast.

Now, if you want to make the expectation become the reality, keep reading.

1. Use meaningful Variable Names

Use meaningful names, which you know exactly what it is at first glance.

// Don't
let xyz = validate(‘amyjandrews’);

// Do
let isUsernameValid = validate(‘amyjandrews’);

It makes sense to name a collection type as plural. Thus, don’t forget the s:

// Don't
let number = [3, 5, 2, 1, 6];

// Do
let numbers = [3, 5, 2, 1, 6];

Functions do things. So, a function’s name should be a verb.

// Don't
function usernameValidation(username) {}

// Do
function validateUsername(username) {}

Start with is for boolean type:

let isValidName = validateName(‘amyjandrews’);

Don’t use constants directly because as time pass you will be like, “What the hell is this?” It’d better to name constants before using them:

// Don't
let area = 5 * 5 * 3.14;

// Do
const PI = 3.14;
let area = 5 * 5 * PI;

For callback functions, don’t be lazy to just name parameters as one character like h, j, d (maybe even you, the father of those name, don’t know what they mean). Long story short, if the parameter is a person, pass person; if it’s a book, pass book:

// Don't
let books = [‘Learn JavaScript’, ‘Coding for Beginners’, ‘CSS the Good Parts’];

books.forEach(function(b) {
  // …
});
// Do
let books = [‘Learn JavaScript’, ‘Coding for Beginners’, ‘CSS the Good Parts’];
books.filter(function(book) {
  // …
});

#coding #javascript-tips #programming #javascript #javascript-development

Kaustav Hazra

1589858834

How to start writing less error-prone code in JavaScript

Everything in JavaScript is an object!’. We said that this assertion is false. Many things in JavaScript can behave like an object, but that doesn’t mean it’s the object. We can say we have three types of objects (objects, functions and arrays) in JavaScript.

In ECMAScript Specification, the functions aren’t on the type list. Intuitively, function values have a specific behaviour, that is different from values that are numbers - so isn’t it a type? JavaScript refers to functions as a sub-type of the object type - sometimes refers to them as a callable object.

Conclusion: Functions are sort of type, but a sub-type - not a top level type…

#javascript-development #javascript-tips #programming-tips #javascript #programming

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