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Introduction to JavaScript flatmap

The flatMap() function in JavaScript is defined as map the elements and making the resultant mapping elements into a new array. This means it makes an into a single dimension array. flatMap() function return type is an array([]).

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Example:

String[] flatMap=array.flatMap(); Where to Use?

When JavaScript functions return an Observable then the result will not be a stream. But it will return an instance of Observable. So, flatMap() function maps this instance into a stream.

An Observable is an object that produces a stream of events.

// [3, 2, 4, 3, 5, 4]

Difference between map(), flat(), and flatMap() Function

map() just maps the values, flat() function return the array as it is where as in flatMap() function returns single dimension array only.

How does flatMap() Work in JavaScript?

flatMap() can be worked in JavaScript by applying flatmap() function on any array then return type becomes an array([]).

Syntax:

array.flatMap(function callback(presentValue, position, arrayReference)) { }

presentValue: Pass current array values.

position: Pass the index. It is an optional argument.

arrayReference: Pass array reference. It is also an optional argument.

Examples to Implement JavaScript flatmap

Following are the examples to implement as given below:

Example #1 – flatmap() logic to division of elements

Code:

let arrayValues = [2, 4, 6, 8];

Output:

Explanation:

Line 1 makes an array into a flat array.

Line 2 makes an array into a map array.

Line 3 makes an array into a flatMap array.

Example #2 – flatMap() logic to spilt() a string

Code:

let stringArray = ["Hi Hello How are you", "Where are you?", "Amardeep"];

Output:

Explanation:

Line 1 splits the string by comma separator and stores in the map.

Line 2 splits the string by comma separator and stores in a flat map.

Example #3 – flatMap() concatenating numbers with other array var array = [4,5,6,7,8,9,10];

Output:

Explanation:

Line 1 concatenates the numbers and return a flatmap.

Example #4 – flatMap() printing multiples

Code:

var array = [1,2,3,4,5,6,7,8,9,10];

Output:

Explanation:

Line 1 gives 2 multiples logic up to 10 values.

Line 2 gives 4 multiples logic up to 10 values.

Line 3 gives 6 multiples logic up to 10 values.

Line 4 gives 8 multiples logic up to 10 values.

Line 5 gives 10 multiples logic up to 10 values.

Line 6 gives 12 multiples logic up to 10 values.

Line 7 gives 14 multiples logic up to 10 values.

Line 8 gives 16 multiples logic up to 10 values.

Example #5 – flatMap() with subtracting from an array

Code:

var array = [100,200,300,400,500,600,700,800,900,1000];

Output:

Explanation:

Line 1 gives logic to subtract 1 from an array.

Line 2 gives logic to subtract 2 from an array.

Line 3 gives logic to subtract 3 from an array.

Line 4 gives logic to subtract 4 from an array.

Line 5 gives logic to subtract 5 from an array.

Line 6 gives logic to subtract 6 from an array.

Line 7 gives logic to subtract 7 from an array.

Line 8 gives logic to subtract 8 from an array.

Example #6 – flatMap with even, odd, negative, and zeros from an array

Code:

const array = [2,3,5,6,8,9,10,11,0,12,14,15,0,-1,-5,-6,-7,-9,0]; return array%2==0 ? [array] : [] }) return array%2==1 ? [array] : [] }) return array<0 ? [array] : [] }) return array==0 ? [array] : [] })

Output:

Explanation:

Line 1 gives logic for displaying even numbers.

Line 2 gives logic for displaying odd numbers.

Line 3 gives logic for displaying negative numbers.

Line 4 gives logic for displaying a number of zeros from an array.

Example #7 – flatMap with key value pair

Code:

var nameArray = ['Paramesh', 'Vivek','Amardeep','Venkatesh','Mahesh','Chinna' ]; var companyArray = ['Verinon', 'EDUCBA','Oracle','IBM','Wipro','TCS' ]; var coursesArray = ['Java', 'Python','C','C#','Spring','Servlets' ];

Output:

Explanation:

Line 1 gives logic for displaying the names index and its corresponding value.

Line 2 gives logic for displaying the company index and its corresponding value.

Line 3 gives logic for displaying the course index and its corresponding value.

Implement Green Screen Algorithm Using Javascript

The green background image is changed and replaced with any effect or other image using the green screen algorithm, also referred to as the chromakey algorithm. In short, what we’re doing is swapping out all of the green pixels in the forward image with their matching counterparts in the background image.

Additionally, we need to keep in mind that the size of the output image should match that of the forward image. In the following step, the pixels from the forward image are duplicated into the new image. Rather than copying green pixels, the backdrop image’s matching pixels are used.

Don’t miss to include the following source file into your HTML code before applying the following code −

The JavaScript code needed to implement this algorithm is provided below. To use it, you must create the HTML code yourself.

HTML Source Code

You have to add this HTML code in the element in your HTML document.

First Image: <input type=”file” multiple=”false” Background Image: <input type=”file” multiple=”false” CSS Source Code

Next, CSS code in the HTML document

canvas { background: rgb(214, 235, 176); border: 1px solid rgb(13, 109, 160); width: 420px; height: 290px; margin: 30px; } h1{ color: rgb(13, 109, 160); } body { background-color: #bbb6ab; } JavaScript Source Code

let forwdImage = null; let secImage = null;

function frontimg() { let fileInput = document.getElementById(“myImageFile”); let canvas = document.getElementById(“image1”); forwdImage = new SimpleImage(fileInput); forwdImage.drawTo(canvas); }

function backimg() { let fileInput = document.getElementById(“bgImageFile”); let canvas = document.getElementById(“image2”); secImage = new SimpleImage(fileInput); secImage.drawTo(canvas); }

function clear() { let image1 = document.getElementById(“image1”); let image2 = document.getElementById(“image2”); let context = image1.getContext(“2d”); context.clearRect(0, 0, image1.width, image1.height); context = image2.getContext(“2d”); context.clearRect(0, 0, image2.width, image2.height); } Example

Let’s examine the complete code and output in the following code now.

canvas { background: rgb(214, 235, 176); border: 1px solid rgb(13, 109, 160); width: 420px; height: 290px; margin: 30px; }

h1 { color: rgb(13, 109, 160); }

body { background-color: #bbb6ab; } let forwdImage = null; let secImage = null;

function backimg() { let fileInput = document.getElementById(“bgImageFile”); let canvas = document.getElementById(“image2”); secImage = new SimpleImage(fileInput); secImage.drawTo(canvas); }

You will see this output screen without adding any image.

Next, you will see this output screen after adding both “First Image” and “Background Image” image.

combined as shown below.

Two pictures serve as the input for this algorithm. The first is a first image with a background of green, as well as the second is a background image that should be used in place of the green background.

The JavaScript combines both images after receiving both as input; consequently, the backward image takes the place of the forward image’s green background. In order to implement the Green Screen Algorithm, the code was provided above.

Implement Vertical Tabs Within Major Browsers

Tabs are an integral part of some software. Browsing the Internet without tabs would feel like a significant downgrade, and tabs have proven so popular they’re developed as extensions for other programs. Their appearance is widely understood, as is their functionality. They’re towards the top of the window and generally rounded or squared off at the corners.

Vertical tabs change the playing field again, and in this article we’ll show you how to get them in browsers that support them.

Vivaldi

We covered Vivaldi in the past, though its default features earmark it for inclusion here. Vivaldi supports vertical tabs as standard despite being a relative of Chromium browsers, which are covered separately.

2. Move the cursor over the “Tools” sub-menu, and then select Settings.

3. A new window will appear with option categories on the left and specific options on the right. Select Tabs on the left, then look for the “Tabs Position” heading.

4. Select either Left Side or Right Side; the latter is a radical departure by most standards. Regardless of what you choose, the tabs should now be vertical.

Under Tab Options is a tickbox to “Show Tab Thumbnails,” and you can experiment with this feature.

Firefox

When it comes to vertical tabs, Firefox presents something of a conundrum. There are numerous extensions which appear to have the functionality, but many of them are outdated. Even if you force compatibility, the odds of them working flawlessly aren’t great due to changes in the browser’s code.

1. Begin by downloading and installing Tab Utilities from the Mozilla Addons website. Accept the associated prompts and restart the browser.

2. Once Firefox has restarted, you’ll notice new buttons on the left of the browser UI.

4. From the options window that appears, you’ll be able to see just how much the extension can do. You’re welcome to tinker with the extension at your leisure, but we’ll skip right ahead to moving the tabs around.

5. Select the “Appearance” heading, and leave it on the first sub-tab.

6. Change the position to either left or right. Like in Vivaldi, moving the tabs to the right side of the browser makes for a big change. Confirm the change, and you should be done.

Chrome / Chromium

Chrome and its related browsers have a lot in common, right down to their extension compatibility. Extensions for Chromium-based browsers are more restrictive than those for Firefox, but you can still get vertical tabs.

From this icon, select “Options,” and you have a variety of options. If you’d like the vertical tabs to appear persistently, we suggest changing their position to “always on.”

Open a new tab – the extension did not appear to work with the tabs we had prior to its installation – and a list of tabs should appear on the left. These can be moved through in the same way as with any other browser.

Beyond the initial setup, vTabs is comparable to the sidebar in Opera due to the breadth and depth of its features, including a built-in “notes” function as well as a button for bringing up your recent tab history.

Conclusion

As you can see, vertical tabs are a rare feature to include as standard and one that you’ll have to put work in for. However, they totally change how you can work with tabs, and they make more efficient use of your screen space. The number of tabs visible at once is greatly increased, though if you’re on a lower resolution display, you may find websites too compressed for your liking.

Paul Ferson

Paul is a Northern Irish tech enthusiast who can normally be found tinkering with Windows software or playing games.

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How To Use Javascript To Create Client

In this tutorial, we will see how we can create a client-side image map using JavaScript.

Before going to discuss the process, let us learn what is image−map.

While creating the image map, we need to use the following HTML tags −

img tag − The image tag is used as usual to embed an image in the document. But this time, we will use image tag with a special attribute named usemap, which takes the value that is given to the name attribute of the map tag preceded by the pound or the hash symbol, as shown in below syntax −

map tag − The map tag is used to create an image map, it links the map with the image to which the value of name attribute is passed as the value of usemap attribute inside the img tag, the syntax is shown below −

area tag − The area tag is used to define the different area parts in the image. This tag takes the href attribute to specify the address of the file or the page it contains. We can give a particular shape out of the rectangle, circle, and polygon to the area tag using the shape attribute and also specify its position on the image using the coords attribute, as shown below −

Let us understand, how we can create a client side image map using JavaScript by practically implementing it with help of code example −

Algorithm

Step 1 − In the first step, we will define an image tag with the usemap attribute as shown in above syntax.

Step 2 − In the next step, we will define a map tag with the name attribute associated with it and give the same values to the name attribute of map tag and the usemap attribute of the img tag.

Step 3 − In the third step, we will create the different hotspots on the image using the area tag with the attributes specified in the above syntax and give them the relevant value.

Step 4 − In the last step, we will add the functionality to show the output on the user screen using JavaScript.

Example 1

In the below example, we create a client-side image map using JavaScript.

function showTutorial(name) { document.myform.stage.value = name }

alt=”HTML Map” border=”0″

<area shape=”poly” coords=”74,0,113,29,98,72,52,72,38,27″ alt=”Perl Tutorial” target=”_self” onMouseOver=”showTutorial(‘perl’)”

<area shape=”rect” coords=”22,83,126,125″ alt=”HTML Tutorial” target=”_self” onMouseOver=”showTutorial(‘html’)”

<area shape=”circle” coords=”73,168,32″ alt=”PHP Tutorial” target=”_self” onMouseOver=”showTutorial(‘php’)”

Let us see another code example to completely understand the implementation of the JavaScript to create client side image map −

Example 2

Below example will explain how to create image map using JavaScript −

<area shape=”poly” coords=”74,0,113,29,98,72,52,72,38,27″ alt=”Perl Tutorial” target=”_self” onMouseOver=”showTutorial(‘Perl Tutorials’)”

<area shape=”circle” coords=”22,83,126,125″ alt=”Java Tutorial” target=”_self” onMouseOver=”showTutorial(‘Java Tutorials’)”

<area shape=”rect” coords=”373,68,32, 456″ alt=”JavaScript Tutorial” target=”_self” onMouseOver=”showTutorial(‘JavaScript Tutorials’)” function showTutorial(name) { var result = document.getElementById(“result”); }

In this tutorial, we have seen how we can create a client side image map using JavaScript. We have seen the practical implementation of the method with two different code examples to create image map, so that we can understand it better and there will be no confusion remained in the minds. We can create as many as hotspots as we want to create on an image and give them links to the different pages.

What Is Automated Device Lifecycle And How To Implement It?

In today’s ever-evolving digital landscape, IT admins must keep up with the latest technologies and ensure devices are always secure and up to date. Remote work has only accelerated the challenges of a rapidly increasing digital transformation. The number of work devices in organizations continues to grow as well.

Apple has been the preferred mobile device choice of end-users for many years. And thanks to an impressive evolution of Apple-specific IT solutions, Apple devices are quickly becoming the most popular and preferred choice for IT administrators.

Why is it happening? There are many reasons behind the explosive Apple adoption among businesses. One of them is the fully automated device life cycle capabilities made possible by Apple solutions designed for companies and the amazing implementation and augmentation by modern Apple Unified Platform providers.

We’ll explain what a fully automated device lifecycle is and how any business can implement it below. For now, though, we can say that with this solution, organizations can automate every single task from the first time an Apple device is turned on to the moment it’s retired years later without IT ever having to physically touch the device.

It all starts with Zero-Touch deployment

Zero-touch deployment for Apple devices allows administrators to set up and configure new devices without having to physically access them. A company can achieve this task by using a modern Apple-specific MDM solution to push the devices required settings and configuration profiles over the air.

With a zero-touch deployment, IT administrators can quickly and easily create universal or group-specific configuration profiles, save them, set them and forget them. When turned on for the first time (and always after a device wipe), all new corporate devices will be automatically enrolled on the MDM solution and automatically configured over the air without IT admins having to perform any action. Think about it as an autopilot but for deploying new work devices.

Zero-touch deployments are even more critical for IT administrators supporting remote employees.

For example, a new (or previously used and wiped device) can be simply shipped to the employees’ home with a single instruction: open it and connect it to your Wi-Fi.

Once the device is connected, everything else will happen automatically with zero need for any action from the IT admin or the employee. The device is ready to go in a few minutes, all work apps are installed, security configurations are enforced, and even nice touches like a welcome wallpaper are applied.

To make automation easier, the best Apple Unified Platform solutions go above and beyond, offering beautiful and elegant tools like Mosyle Embark that deliver essential information and guide the employee during setup. Mosyle Embark lets them know which tasks are being performed, which apps are installed and how long it will take for all the functions to the completed. It’s a compelling WOW-factor for any first day of work!

Ongoing management comes next

Once a device is deployed, the goal changes from installing apps and enforcing configurations to keeping the operating system and apps up to date. IT admins also need to establish new applications and solutions the company will adopt and ensure the entire fleet of devices is secure.

Once again, with the support of a leading Apple Unified Platform, all of those tasks can be put on autopilot.

Powerful patch management tools and workflows will ensure all corporate apps on all work devices are always running the last version without impacting employees with manual flows or forced updates during the wrong times, such as when the updated app is in use.

Apple Unified Platforms will also constantly monitor devices for security configurations and detect threats, fixing configurations and neutralizing malware without any manual action required.

And the best part is that ongoing management, if provided by a leading provider, will scale indefinitely without adding any extra work or complexity to the existing IT team.

And the cycle ends with decommissioning

Securely wiping corporate devices when replacing them is vital to ensure the security and privacy of the company’s data. Without wiping, confidential information such as company passwords, customer data, financial information, and other sensitive data may be left on the hard drive and could be accessed by unauthorized individuals.

Additionally, securely wiping corporate devices helps prevent data breaches and other security issues, and ensures legal compliance with data privacy regulations such as GDPR.

Decommissioning is also very important when an employee is terminated. Companies can fully automate a proper device wipe based on integrations with the centralized user directory or human resources solutions.

Let’s say a company uses Google Workspace for email and productivity. An Apple Unified Platform solution, such as Mosyle, can be fully integrated with Google Workspace. Automated workflows can be created based on whether employees exist or if they’re part of a specific Google group.

This would allow an IT administrator to set a simple policy that would automatically and securely wipe a Mac if the user assigned to that device was deleted from Google Workspace. Once this policy is created, it becomes a fully automated workflow, ensuring a perfect device decommissioning every time without any manual work.

The benefits of fully automated device lifecycle

There are several benefits for companies fully automating the devices’ lifecycle.

First, automating tasks and workflows and not relying on human actions will materially increase consistency and ensure that the correct actions are implemented every time. In some moments, all it takes is one mistake, such as forgetting to properly decommission a device before returning it at the end of the leasing, to create horrible consequences, such as a data breach.

Second, companies can generate relevant savings in labor by automating the deployment, ongoing management and decommissioning of work devices. A single IT administrator can comfortably manage hundreds (if not thousands) of Apple devices by implementing a fully automated device lifecycle strategy with a leading Apple Unified Platform solution.

Third, employees will have a much better experience with their work devices. Most of the maintenance tasks they would be expected to perform will happen automatically and silently, letting them work only on productive tasks. Also, an automated device lifecycle strategy will materially reduce the need for IT support by employees, saving employees time and eliminating frustration while also optimizing the work of the helpdesk team.

And how do you implement this strategy?

Any company leveraging Apple devices can seamlessly implement a fully automated device lifecycle strategy, and you will be surprised by how little it can cost.

The best way to start is by selecting a great Apple Unified Platform solution. Mosyle, a leader in this space, provides customers with all the technical tools needed for a fully automated device lifecycle strategy for Apple devices and delivers the necessary help and support to implement it without any extra cost.

Mosyle is also an excellent example of how inexpensive it can be to implement a fully automated device lifecycle strategy. Companies with less than 30 devices can do it for FREE, and for larger fleets, it can cost as little as $1 per device per month.

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Linked List Representation In Javascript

Operations in Linked List

There are several operations in Linked list, which are adding a node, deleting a node and searching a node. which are detailed in the below scenarios.

Creating a Node

Let’s see the scenario of linked list node below −

class Node { constructor(element){ this.element = element, chúng tôi = null } }

In the above scenario, we have created a Node which has two properties: element and next. Element holds the data of the node and the second property “next” will holds the pointer referring to the next node. In above example next is referring to NULL because there is only node in linked list.

Creating a Linked list class

Below is the method to create a linked list class −

class LinkedList{ constructor(element){ this.head_of_LL = { element: element, next : null }; this.length = 1; } }

In the above snippet, we have created a linked list class that will perform adding, deleting and searching the nodes. And the length of this list is defined as 1, as there is only one node in the linked list (head is also the last node).

Adding Node at Beginning

Following is the algorithm to add node at head of the Linked List −

Create a New node by creating instance of node class.

Point New node’s next to the head.

Now, make New node as head.

The following is the method to add a node at head position −

Add_node(element){ const newNode = new Node(element); chúng tôi = this.head_of_LL; this.head_of_LL = newNode; this.length++; return this; } Deleting a node at Beginning

Following is the algorithm to delete node at head of the Linked List −

Make the very next element of deleted element as head.

Now, decrease the length of Linked list by 1.

This is the method below to delete a node at head position −

delete_head_node(){ this.head_of_LL = this.head_of_LL.next; this.length--; }

Here, we are performing to delete the element at head position in linked list. The next node of deleted element will become the new head and length of the linked list will reduce by 1.

Searching an element

Following is the algorithm to search for an element in the Linked List −

Traverse the entire linked list.

Now, Compare the values

Return true, if found

Else, return false.

The below scenario is searching an element in the linked list −

search_Node(element){ let curr_Node = this.head_of_LL; while(curr_Node !== null){ if(curr_Node.element === element) return true; curr_Node = curr_Node.next; } return false; } Implementation of Linked list

We are implementing a Linked List data structure in JavaScript. In Linked List we can perform the operations like adding and deleting the elements, searching an element. In the code below we have implemented all the above mentioned operations.

Example

Let’s look into the final execution of code below −

class

Node

{

constructor

(

element

)

{

this

element

this

null

}

class

LinkedList

{

constructor

(

element

)

{

this

head_of_LL

{

element

null

}

;

this

length

;

}

Add_node

(

element

)

{

const

newNode

new

Node

(

element

)

;

newNode

this

head_of_LL

;

this

head_of_LL

newNode

;

this

length

;

return

this

;

}

delete_head_node

(

)

{

this

head_of_LL

this

head_of_LL

;

this

length

—

;

}

search_Node

(

element

)

{

let

curr_Node

this

head_of_LL

;

while

(

curr_Node

!==

null

)

{

(

curr_Node

element

===

element

)

return

true

;

curr_Node

;

}

return

false

;

}

getLinkedlist

(

)

{

let

getArrayList

[

]

;

let

curr_Node

this

head_of_LL

;

while

(

curr_Node

!==

null

)

{

getArrayList

push

(

curr_Node

element

)

;

curr_Node

;

}

return

getArrayList

join

(

‘ → ‘

)

;

}

document

write

(

“Creating a LL with node 44:”

)

;

const

myLinkedList

new

LinkedList

(

)

;

document

write

(

myLinkedList

getLinkedlist

(

)

;

document

write

(

‘Adding nodes (33, 22 and 11) at head position :’

)

;

myLinkedList

Add_node

(

)

;

myLinkedList

Add_node

(

)

;

myLinkedList

Add_node

(

)

;

document

write

(

myLinkedList

getLinkedlist

(

)

;

document

write

(

‘Deleting (32) node at head position :’

)

;

myLinkedList

delete_head_node

(

)

;

document

write

(

myLinkedList

getLinkedlist

(

)

;

document

write

(

‘Searching for element 11 :’

)

;

document

write

(

myLinkedList

getLinkedlist

(

)

;

document

write

(

myLinkedList

search_Node

(

)

;

document

write

(

‘Searching for element 55 :’

)

;

document

write

(

myLinkedList

getLinkedlist

(

)

;

document

write

(

myLinkedList

search_Node

(

)

;

Output

The output of the above script will be −

Creating a LL with node 44: 44 Adding nodes (33, 22 and 11) at head position : 33 → 22 → 11 → 44 Deleting (32) node at head position : 22 → 11 → 44 Searching for element 11 : 22 → 11 → 44 true Searching for element 55 : 22 → 11 → 44 false

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