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I am a certified ethical hacker. Iam expert in Linux administration, web hosting, cloud administration, managing mail server administration, Office365...Read More
Gokul U.System administrator, India
$3 /hr
6 Years Exp.
0 Followers
I am a desktop support engineer with 6 years of experience in the field. I have knowledge in Windows Technologies, ITIL concepts and procedures.
Gopinath Windows System Administrator, India
$10 /hr
5 Years Exp.
0 Followers
I am well experienced in Windows server support. Managing Windows VM's for various roles. Worked on Active Directory, DNS, DHCP, SharePoint.Windo...Read More
Helmuth Kisting Linux System Administration, Namibia
$50 /hr
21 Years Exp.
0 Followers
I am experienced in Linux System Administration, Apache Webserver setup and maintenance, Exim, Sendmail, BIND, standard MySQL experience, monitoring a...Read More
Charmaine Rose A.Server Support Consultant, Philippines
$25 /hr
0 Years Exp.
0 Followers
I am a certified cPanel license exam passer, knowledgeable in troubleshooting DNS, Linux-based, Windows-based server consultant support for 7 years.
Ambient Infotech Full Stack Developer, United Arab Emirates
$15 /hr
7 Years Exp.
0 Followers
Innovative optimized solution seeker. Excited to be in the deployment phase of my new career as a Full Stack Developer. I am ambitious, adventurous, a...Read More
Abiodun A.VOIP, A/V, Web - Software/Solution Engineer , Nigeria
$32 /hr
4 Years Exp.
0 Followers
I am as a Software developer with 4 years+ experience developing mission-critical applications such as ERP, Contact Center, CloudPBX solutions and A/V...Read More
I am certified and 14 years experienced Unix/Linux/Vmware system Engineer/administrator working in well known Software companies and Global banks.
I am a MSC IT ,MCSE,MCSA,MCP Microsoft Certified System Administrator having 15 Years experience • Managing 2000 Windows Servers (Production, Disaster...Read More
Allen Dale Nery I.T. Systems Engineer, Philippines
$15 /hr
11 Years Exp.
0 Followers
Technical Certification: • Microsoft Certified Professional • Microsoft Certified Specialist: o Implementing Microsoft Azure Infrastructure Solutio...Read More
Kleo B.System Administrator, Philippines
$39 /hr
2 Years Exp.
0 Followers
System Administrator capable of providing self hosted services for your company, prioritizing your security and privacy.
Diomelito D.IT Helpdesk and Technical Analyst, Philippines
$7 /hr
4 Years Exp.
0 Followers
I have over 6 years of experience in customer service and technical support in the BPO industry, 4 years in website hosting and server management, a s...Read More
Mallikarjun Reddy Senior Analyst, IT-Infrastructure, India
$20 /hr
13 Years Exp.
0 Followers
ITIL v3 Foundations certified, Project Management Basics trained and Microsoft Certified (MCSE) Windows server Core Infrastructure administrator with...Read More
Sunil Panigrahi Senior Application Developer, India
$19 /hr
8 Years Exp.
0 Followers
I have 8+ years of experience in application development. I mostly work on embedded C but have detailed knowledge of C++ as well. Linux is the operati...Read More
Angel Baez WHM Security Expert, Wordpress, and Joomla migration Expert, Dominican Republic
$14 /hr
10 Years Exp.
0 Followers
8 Years experience in WHM/cPanel Security and Server administration. *CMS*: -Joomla -Wordpress *Database*: -Mysql/MariaDB -phpmyadmin *DNS*: -MX...Read More
Cale Customer Care Specialist, Philippines
$5 /hr
3 Years Exp.
0 Followers
I'm Cale and I appreciate you for checking out my Profile. I have been working as a Customer Care Specialist for over 3 years and what I have lea...Read More
Sonam Linux, India
$50 /hr
15 Years Exp.
0 Followers
A to Z with GNU/Linux, I have created custom Linux distributions as well as chrome os using source codes.
Prakash P.Website Specialist, India
$17 /hr
12 Years Exp.
0 Followers
Hello, Please accept this letter as my application for the role of Wordpress Developer/ Web Specialist for Remote Work. I believe that, with my ski...Read More
Arhnelie V.Senior Data Analyst, Philippines
/hr
0 Years Exp.
0 Followers
I am proficient in all Microsoft office programs and very familiar with the internet and its application. I have worked with many clients across Unite...Read More
Srv I.IT services and security system, India
$9 /hr
8 Years Exp.
0 Followers
SRV Infosystem provides high-quality IT hardware and software with quality and efficiency to meet complete customer's need and choice. IT solutio...Read More
Pranali A.Engineer , India
$9 /hr
3 Years Exp.
0 Followers
I have 3 years of experience in technical support and quality assurance
Junaid Shaikh Technical support specialist, India
$17 /hr
3 Years Exp.
0 Followers
I am a Senior techical support specialist and specialized in Domains and hosting services and DNS. I have over 3 years of experience.
Pankaj Kumar Senior Digital Analyst, India
$20 /hr
5 Years Exp.
0 Followers
I am a deliverability expert plus have sound knowledge in CRM, email marketing.
Ajit J.Back Office Exceutive, India
$14 /hr
2 Years Exp.
0 Followers
I am ajit jagtap I have experience in Linux System Admin From last 4 Years I am redhat system administrator(global certification) & also i have r...Read More
Sachin R.Web Operations Manager, India
/hr
10 Years Exp.
0 Followers
I am currently working as a Web Operations Manager in Logicserve Digital Pvt Ltd. I manage domains and hosting of the company as well as wordpress ins...Read More
Rahul Administrative Co-ordinator, India
$2 /hr
15 Years Exp.
0 Followers
I am a Data Entry expert with 15+ years of experience. I have my team for Data Entry speedily. Also I can convert any data into any format.
Balvinder S.SERVER ADMINISTRATOR, India
$9 /hr
5 Years Exp.
0 Followers
I love helping companies / clients to deploy their code / applications to well managed, optimized, secure server and can go extra mile to satisfy....Read More
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Articles Related To Dos


As you know, JavaScript is the top programming language in the world, the language of the web, of mobile hybrid apps (like PhoneGap or Appcelerator), of the server side (like NodeJS or Wakanda) and has many other implementations. It’s also the starting point for many new developers to the world of programming, as it can be used to display a simple alert in the web browser but also to control a robot (using nodebot, or nodruino). The developers who master JavaScript and write organized and performant code have become the most sought after in the job market.

 

In this article, I’ll share a set of JavaScript tips, tricks and best practices that should be known by all JavaScript developers regardless of their browser/engine or the SSJS (Server Side JavaScript) interpreter.

 

Don’t forget var” keyword when assigning a variable’s value for the first time.

Assignment to an undeclared variable automatically results in a global variable being created. Avoid global variables.

Use “===” instead of “==”

The == (or !=) operator performs an automatic type conversion if needed. The === (or !==) operator will not perform any conversion. It compares the value and the type, which could be considered faster than ==

[10] === 10    // is false

[10]  == 10    // is true

'10' == 10     // is true

'10' === 10    // is false

 []   == 0     // is true

 [] ===  0     // is false

 '' == false   // is true but true == "a" is false

 '' ===   false // is false 

undefined, null, 0, false, NaN, '' (empty string) are all falsy.

 

Use Semicolons for line termination

The use of semi-colons for line termination is a good practice. You won’t be warned if you forget it, because in most cases it will be inserted by the JavaScript parser. For more details about why you should use semi-colons.

 

Create an object constructor

function Person(firstName, lastName){

    this.firstName =  firstName;

    this.lastName = lastName;        

}  

var Khalid = new Person("Khalid", "Ansari");

 

Be careful when using typeof, instanceof and constructor.

typeof: a JavaScript unary operator used to return a string that represents the primitive type of a variable, don’t forget that typeof null will return “object”, and for the majority of object types (Array, Date, and others) will return also “object”.

constructor: is a property of the internal prototype property, which could be overridden by code.

 

instanceof: is another JavaScript operator that check in all the prototypes chain the constructor it returns true if it’s found and false if not.

 

var arr = ["a", "b", "c"];

typeof arr;   // return "object" 

arr  instanceof Array // true

arr.constructor();  //[]

 

Define a Self-calling Function

This is often called a Self-Invoked Anonymous Function or Immediately Invoked Function Expression (IIFE). It is a function that executes automatically when you create it, If you want to use this function you can write in the following way: 

 

(function(){

    // some private code that will be executed automatically

})();  

(function(p,q){

    var r = p+q;

    return r;

})(40,50);

 

Get a random item from an array

var items_array = [12, 548 , 'a' , 2 , 5478 , 'toogit' , 8852, , 'freelance' , 2145 , 119];

var  randomItem = items[Math.floor(Math.random() * items.length)];

 

Get a random number in a specific range

This code snippet can be useful when trying to generate fake data for testing purposes, such as a salary between min and max.

var x = Math.floor(Math.random() * (max - min + 1)) + min;

 

Generate an array of numbers with numbers from 0 to max

var numbersArray = [] , max = 100;

for( var i=1; numbersArray.push(i++) < max;);  // numbers = [1,2,3 ... 100] 

 

Generate a random set of alphanumeric characters

function generateRandomAlphaNum(len) {

    var rdmString = "";

    for( ; rdmString.length < len; rdmString  += Math.random().toString(36).substr(2));

    return  rdmString.substr(0, len);

}

 

Shuffle an array of numbers

var numbers = [5, 458 , 120 , -215 , 228 , 400 , 122205, -85411];

numbers = numbers.sort(function(){ return Math.random() - 0.5});

 

A better option could be to implement a random sort order by code (e.g. : Fisher-Yates shuffle), than using the native sort JavaScript function

 

A string trim function

The classic trim function of Java, C#, PHP and many other language that remove whitespace from a string doesn’t exist in JavaScript, so we could add it to the String object.

String.prototype.trim = function(){return this.replace(/^s+|s+$/g, "");};  

A native implementation of the trim() function is available in the recent JavaScript engines.

 

Append an array to another array

var array1 = [12 , "foo" , {name "Joe"} , -2458];

var array2 = ["Doe" , 555 , 100];

Array.prototype.push.apply(array1, array2);

 

Transform the arguments object into an array

var argArray = Array.prototype.slice.call(arguments);

 

Verify that a given argument is a number

function isNumber(n){

    return !isNaN(parseFloat(n)) && isFinite(n);

}

 

Verify that a given argument is an array

function isArray(obj){

    return Object.prototype.toString.call(obj) === '[object Array]' ;

}

Note that if the toString() method is overridden, you will not get the expected result using this trick.

Or Use..

Array.isArray(obj); // its a new Array method

You could also use instanceofif you are not working with multiple frames. However, if you have many contexts, you will get a wrong result.

var myFrame = document.createElement('iframe');

document.body.appendChild(myFrame);

var myArray = window.frames[window.frames.length-1].Array;

var arr = new myArray(a,b,10); // [a,b,10]  

// instanceof will not work correctly, myArray loses his constructor 

// constructor is not shared between frames

arr instanceof Array; // false

 

Get the max or the min in an array of numbers

var  numbers = [5, 458 , 120 , -215 , 228 , 400 , 122205, -85411]; 

var maxInNumbers = Math.max.apply(Math, numbers); 

var minInNumbers = Math.min.apply(Math, numbers);

 

Empty an array

var myArray = [12 , 222 , 1000 ];  

myArray.length = 0; // myArray will be equal to [].

 

Don’t use delete to remove an item from array

Use splice instead of using delete to delete an item from an array. Using delete replaces the item with undefined instead of the removing it from the array.

Instead of…

var items = [12, 548 ,'a' , 2 , 5478 , 'foo' , 8852, , 'Doe' ,2154 , 119 ]; 

items.length; // return 11 

delete items[3]; // return true 

items.length; // return 11 

Use

var items = [12, 548 ,'a' , 2 , 5478 , 'foo' , 8852, , 'Doe' ,2154 , 119 ]; 

items.length; // return 11 

items.splice(3,1) ; 

items.length; // return 10 

 

Clearing or truncating an array

An easy way of clearing or truncating an array without reassigning it is by changing its length property value:

const arr = [11,22,33,44,55,66];

// truncanting

arr.length = 3;

console.log(arr); //=> [11, 22, 33]

// clearing

arr.length = 0;

console.log(arr); //=> []

console.log(arr[2]); //=> undefined

 

Simulating named parameters with object destructuring

Chances are high that you’re already using configuration objects when you need to pass a variable set of options to some function, like this:

doSomething({ foo: 'Hello', bar: 'Toogit!', baz: 42 });

function doSomething(config) {  

const foo = config.foo !== undefined ? config.foo : 'Hi';  const bar = config.bar !== undefined ? config.bar : 'Me!';  const baz = config.baz !== undefined ? config.baz : 13;  // ...

}

This is an old but effective pattern, which tries to simulate named parameters in JavaScript. The function calling looks fine. On the other hand, the config object handling logic is unnecessarily verbose. With ES2015 object destructuring, you can circumvent this downside:

function doSomething({ foo = 'Hello', bar = 'Toogit!', baz = 13 }) {  // ...}

And if you need to make the config object optional, it’s very simple, too:

function doSomething({ foo = 'Hello', bar = 'Toogit!', baz = 13 } = {}) {  // ...}

 

Object destructuring for array items

Assign array items to individual variables with object destructuring:

const csvFileLine = '1997,John Doe,US,john@doe.com,New York';const { 2: country, 4: state } = csvFileLine.split(',');

 

 

What is the difference between Java and JavaScript?

 

These are two different programming languages.

 

Javascript is a language that has gained tremendous popularity as a language on the web browsers to create dynamic and interactive web pages.

 

Java is a language that has got a similar popularity when you build a “backend” system, which is a fancy word for “almost anything”.

 

Despite the common prefix, they are not related; there creators are different and so are their origin stories (as highlighted by other answers). 

- JavaScript is a genius marketing scam that polluted the world of browsers exceptionally well. The browser reads JavaScript’s code line by line and executes it.

 

- Java is a general purpose language that is used almost everywhere, from Android mobile apps and cryptography to OS and cloud computing. Java’s code is stored in bytecoded format and then gets JIT compiled before the actual execution. In other words, it translates the bytecode to machine code.

 

- Java is class based. JS is prototype based. All objects, like Array or Function inherit from the Object.prototype which remains on top of the chain.

 

- JavaScript uses dynamic type checking (checks the variables while the code executes), unlike Java’s static checking system (variables are verified at compile time), which is more bug free.

 

- The word “Script.” It’s a joke, in case you didn’t get it.

 

 

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