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In this tutorial, we will learn how to print object arrays in JavaScript.

What is an object array or an array of objects? An array of objects is used to store a fixed-size sequential collection of identical elements and store many values in one variable.

Next, we will see the options to print an array of objects in JavaScript.

Using the stringify() Method of the JSON Object

Users can follow the syntax below to use this.

Syntax JSON.stringify(v,r,s)

In the syntax above, the last two parameters are optional.

Parameters

v − This is the array of objects.

r − This is the replacer. It can change the output by altering or eliminating values. The method will print all values if the r value is null or unspecified. Either a function or an array is used as a replacer.

s − This is the spacing value for the output display. It is for readability purposes. Nothing, null, string, or 1-10 are the possible values of this parameter. If the value is less than 1, JSON print will not have space. If the value is greater than 10, 10 only is taken for indentation. If the value is a string, either the string or the first ten characters of the string are considered for spacing.

Example

Here in this code, we are taking an array of objects. JSON.stringify() is called directly with this value. Here, the indentation is 1. A condition is given to display the name key alone from the JSON object. This is the second parameter.

let

arr

=

[

{

name

:

“Orange”

,

value

:

1

}

,

{

name

:

“Grapes”

,

value

:

2

}

,

{

name

:

“Apple”

,

value

:

3

}

]

;

document

.

getElementById

(

“idPrint”

)

.

innerHTML

=

JSON

.

stringify

(

arr

,

null

,

4

)

;

Using console.table() Method

Here we will learn how the console.table() method works. This method strictly needs one input. The input is either an array or an object. The method also processes nested cases of both the array and the objects. The second parameter is the column, which is optional.

All browsers that use standard consoles support this method, and Internet Explorer does not support it.

Users can follow the syntax below to use this.

Syntax console.table(d, c)

In the syntax above, we need to give the array of objects as the first input.

Parameters

d − An array of objects.

c − Here, we need to specify the key names of the object. The specified key’s keyvalue pairs only will is displayed in the output.

Example

We are creating an array of objects in this example program using the new method. This data is given as the first parameter to the console.table() method.

Here, three objects are there in the input. But we have restricted to display of only two in the table format. The key names of the required objects are given as the second parameter. The console.log() method with the program title in the first parameter and the CSS values as the next parameters display the styled title in the following output.

Users need to open the console to see the output for the below example.

function

infoDisp

(

id

,

name

,

job

)

{

this

.

Id

=

id

;

this

.

Name

=

name

;

this

.

Work

=

job

;

}

const

a

=

new

infoDisp

(

1

,

“John”

,

“Doctor”

)

;

const

b

=

new

infoDisp

(

2

,

“Grace”

,

“Homemaker”

)

;

const

c

=

new

infoDisp

(

3

,

“Eagan”

,

“Not working”

)

;

console

.

log

(

%

cThe JavaScript program prints an array

of

objects using

%

cconsole

.

table

(

)

method

‘, ‘

font

weight

:

bold

;

font

size

:

16

px

;

color

:

#

000000

;

‘, ‘

font

weight

:

bold

;

font

style

:

italic

;

font

size

:

16

px

;

color

:

#

000000

;

)

;

console

.

table

(

[

a

,

b

,

c

]

,

[

“Name”

,

“Work”

]

)

;

This tutorial helped us to learn about the two ways to print an object array. We use the console.dir() generally to verify the object array. To display the object array on the page, JSON.stringify() is used.

We can use the console if we need the table format of the object array.table() method. The only drawback is that some consoles do not support this method. Some console displays the column names in ascending order. That is, the actual object key order is lost.

In short, both methods are simple. Users have choice to choose any method according to their print requirements.

You're reading How To Print Object Array In Javascript?

How To Remove Last Array Element In Javascript And Return It?

In this tutorial, we will learn how to remove the last array element in JavaScript and return it.

In JavaScript, arrays are described as list-like objects. A single array object can store multiple values. An array object is stored in a variable. Array elements are stored in a memory location. Each array element is identified by its index value.

You must process an array by inserting an element, removing or changing, etc. JavaScript has a lot of methods to update an array. Let us look at various ways to remove the last array element in JavaScript.

Following are the Methods/Functions to remove the last array element −

The Array pop() Method

The Array splice() Method

Using the Array pop() Method

The Array pop() method is the simplest method used to remove the last element in an array. The pop() method returns the removed element from the original array.

Syntax

The below given syntax uses the pop() method to remove the last element of an array.

arr.pop();

Here arr is the original array.

Example

In the example stated below, we have used the pop() method to remove the last element of an array. We have taken two array examples and removed the last element of each of those by using pop().

let

output1

=

document

.

getElementById

(

“output1”

)

;

let

output2

=

document

.

getElementById

(

“output2”

)

;

let

output

=

“”

;

let

arr1

=

[

1

,

2

,

3

,

4

,

5

]

;

output

=

output

+

“Array after pop(): “

+

arr1

;

output1

.

innerHTML

=

output

;

let

arr2

=

[

“A”

,

“B”

,

“C”

,

“D”

,

“E”

,

“F”

]

;

output

=

output

+

“Array after pop() = “

+

arr2

;

output2

.

innerHTML

=

output

;

In the above two examples, users can see that the pop() method returned the removed element from an array and changed the original array.

Using the Array splice() Method

The splice() method is used to add or remove elements from an array.

The splice() method can change the original Array.

Syntax

The below-given syntax uses the splice() method to remove the last element of an array.

arr.splice(-1) arr.splice(arr.length-1)

Here arr is the original array.

Example

In the example stated below, we are using the splice() method to remove the last element of an array. We have taken two array examples and removed the last element of each of those by using splice().

let

output1

=

document

.

getElementById

(

“output1”

)

;

let

output2

=

document

.

getElementById

(

“output2”

)

;

let

output

=

“”

;

let

arr1

=

[

1

,

2

,

3

,

4

,

5

]

;

output

=

output

+

“The original array = “

+

arr1

;

output1

.

innerHTML

=

output

;

let

arr2

=

[

“A”

,

“B”

,

“C”

,

“D”

,

“E”

]

;

output

=

output

+

“The original array = “

+

arr2

;

output2

.

innerHTML

=

output

;

We have learned two methods, using which we can remove the last array element in JavaScript. Among these methods, pop() is the easiest way to remove the last element of an array. It is the best practice to use the pop() method in real-world problems.

The splice() is used to add or remove the elements on a specific index.

Algorithm To Get The Combinations Of All Items In Array Javascript

In this problem statement, our task is to get the combinations of all items in an array with the help of Javascript functionalities. So for doing this task we can use a recursive approach that iteratively adds items to a running list of combinations.

Understanding the problem statement

The problem statement is to write a function in Javascript that will help to find out the combinations of all the elements in an array and create a separate array to show these combinations. For example, if we have an array [ 1, 2 ] so the combinations of this array will be [ [ 1, 2 ], [ 2 ] ].

Logic for the given problem

To create a function to get all the possible combinations of items in an array in Javascript can be done using a recursive algorithm which will iteratively add items to a list of combinations. So first we will define an array and initialize it as empty. Inside the created function we will define another function to recurse the running list of combinations.

Algorithm

Step 1 − Declare a function called getCombinations which is using a parameter of array.

Step 2 − Declare a result array inside the function which will hold our final list of combinations.

Step 3 − Define another function called recurse which will take two arguments cur and rem, here cur is the running list of items and rem is the array of items we have left to add in the combinations.

Step 4 − And after this if there are no items left in the rem array we will push current into the result array because we have reached the required result.

Step 5 − Otherwise we will iterate every item in the rem array and recursively call a recursive function with a new cur array that will include the current item.

Step 6 − Call recurse initially with an empty cur array and the full array we want to generate combinations for.

Step 7 − Return the final result array which contains all possible combinations of the input array.

Code for the algorithm function getCombinations(array) { const result = []; function recurse(cur, rem) { if (rem.length === 0) { result.push(cur); } else { for (let i = 0; i < rem.length; i++) { recurse([...cur, rem[i]], rem.slice(i + 1)); } } } recurse([], array); return result; } const array = [10, 20, 30, 40]; const combinations = getCombinations(array); console.log(combinations); Complexity

The time complexity for the above created function is O(2^n) because the algorithm generates all possible combinations of items in the array and there are 2^n possible combinations. And the space complexity for the code is also O(2^n) because the algorithm generates a list of 2^n combinations.

Conclusion

The above code provides a simple solution to generate all possible combinations of items in an array in Javascript. So it has an O(2^n) time and space complexity which can make it less efficient for large arrays. So it is important to note the size of the array when deciding whether to use this algorithm.

How To Implement Stack Method In Javascript?

Definition of JavaScript Stack

JavaScript stack can be implemented easily by using the array data structure available in it. A stack is a basic data structure that allows us to store the data and retrieve it in Last In First Out (LIFO) or First In Last Out (FILO) order. This means the data which is inserted first into the stack can be removed at last or the data which is inserted at the last can be removed first. The data access to the stack is only accessible from one end of it. JavaScript stack will have two main methods, one is to insert the element into the stack and the second is to remove the element from the stack.

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Methods to Implement Javascript Stack 1. Push

This method will insert the element into the stack. The element will be inserted on the top of the stack. As shown in the figure, the stack grows from one side of it. The top represents the value to which is stack is pointing currently. After every push operation, the top will be incremented by one. The top is also known as a stack pointer. When the stack is empty i.e. no elements are present in it the top will point to -1 in our case.

Code:

JavaScript Stack .body-data { border : #81D4FA 2px solid; background-color : #03a9f400; text-align : left; padding-left : 20px; padding-bottom: 20px; height : auto; width : auto; } .resultText { margin: 0 0 3px 0; padding: 0px; display: block;font-weight: bold; } .heading { font-weight: bold; border-bottom: 2px solid #ddd; font-size: 15px; width: 98%; } class Stack { constructor () { this.stack = []; this.top = -1; } push (value) { this.top++; console.log( “Inserting Element: ” + value ); this.stack[ chúng tôi ] = value; } printElements(id) { let elements = “”; for(vari=0;i<=this.top;i++){ elements += this.stack[i] + ” “; } document.getElementById(id).innerHTML += elements; } } let myStack = new Stack(); myStack.push( 5 ); myStack.push( 10 ); myStack.push( 12);myStack.push( 20 ); myStack.push( 35 ); myStack.printElements(“result1”);

Here, We have declared on class for implementing a stack. There are two main variables defined in the class, the stack is an array to store the data, and the top is to maintain the position of the last inserted element into the stack. One method is implemented to push the elements and another is implemented to display the stack elements.

Output: After push operations.

2. isEmpty()

This method will check if the stack is empty and will return true or false. When the stack does not contain any element then the Top will be pointing to -1 i.e., not any element. To check for the stack if it is empty, we can use this pointer. Whenever the Top will be pointing nowhere or to -1 then we can say the stack is empty. We will implement this method in the same way.

Code:

JavaScript Stack .body-data { border : #81D4FA 2px solid; background-color : #03a9f400; text-align : left; padding-left : 20px; padding-bottom: 20px; height : auto; width : auto; } .heading { font-weight: bold; border-bottom: 2px solid #ddd; font-size: 15px; width: 98%; } class Stack { constructor () { this.stack = []; this.top = -1; } push (value) { this.top++; console.log( “Inserting Element: ” + value ); this.stack[ chúng tôi ] = value; } printElements(id) { let elements = “”; for(vari=0;i<=this.top;i++){ elements += this.stack[i] + ” “; } console.log( elements ); document.getElementById(id).innerHTML += elements; } isEmpty(){ return chúng tôi === -1; } } let myStack = new Stack(); myStack.push( 5 ); myStack.push( 10 ); myStack.push( 12); myStack.push( 20 ); myStack.push( 35 ); myStack.printElements(“result1”); document.getElementById(“result2”).innerHTML += myStack.isEmpty();

Output:

3. size

This method will return the size of the stack i.e. how many elements are present in the stack. As the Top variable holds the index at which the last element is stored, we can use this pointer to find out the size of the stack. As the indexing of array is from 0 we can add 1 to the Top and find out the size of the stack.

JavaScript Stack .body-data { border : #81D4FA 2px solid; background-color : #03a9f400; text-align : left; padding-left : 20px; padding-bottom: 20px; height : auto; width : auto; } .heading { font-weight: bold; border-bottom: 2px solid #ddd; font-size: 15px; width: 98%; } class Stack { constructor () { this.stack = []; this.top = -1; } push (value) { this.top++; console.log( “Inserting Element: ” + value ); this.stack[ chúng tôi ] = value; } printElements(id) { let elements = “”; for(vari=0;i<=this.top;i++){ elements += this.stack[i] + ” “; } console.log( elements ); document.getElementById(id).innerHTML += elements; } isEmpty(){ return chúng tôi === -1; } size() { return chúng tôi + 1; } } let myStack = new Stack(); myStack.push( 5 ); myStack.push( 10 ); myStack.push( 12); myStack.push( 20 ); myStack.push( 35 ); myStack.printElements(“result1”); document.getElementById(“result2”).innerHTML += myStack.isEmpty(); document.getElementById(“result3”).innerHTML += myStack.size();

Output:

4. pop

This method will remove the element from the stack. The removed element will be the top element from the stack. As the Top is pointing to the last element, the pop() operation will remove the element at this position. The Top will be decremented by 1 and will point to the element below the previous element.

Code:

JavaScript Stack .body-data { border : #81D4FA 2px solid; background-color : #03a9f400; text-align : left; padding-left : 20px; padding-bottom: 20px; height : auto; width : auto; } .heading { font-weight: bold; border-bottom: 2px solid #ddd; font-size: 15px; width: 98%; } class Stack { constructor () { this.stack = []; this.top = -1; } push (value) { this.top++; console.log( “Inserting Element: ” + value ); this.stack[ chúng tôi ] = value; } printElements(id) { let elements = “”; for(vari=0;i<=this.top;i++){ elements += this.stack[i] + ” “; } console.log( elements ); document.getElementById(id).innerHTML += elements; } isEmpty(){ return chúng tôi === -1; } size() { return chúng tôi + 1; } pop() { if(this.isEmpty()){ return “Stack is Empty”; } else { varval = this.stack[this.top]; this.top –; return val; } } } let myStack = new Stack(); myStack.push( 5 ); myStack.push( 10 ); myStack.push( 12); myStack.push( 20 ); myStack.push( 35 ); myStack.printElements(“result1”); document.getElementById(“result2”).innerHTML += myStack.pop(); myStack.printElements(“result3”);

Output:

5. peek

Code:

JavaScript Stack .body-data { border : #81D4FA 2px solid; background-color : #03a9f400; text-align : left; padding-left : 20px; padding-bottom: 20px; height : auto; width : auto; } .heading { font-weight: bold; border-bottom: 2px solid #ddd; font-size: 15px; width: 98%; } class Stack { constructor () { this.stack = []; this.top = -1; } push (value) { this.top++; console.log( “Inserting Element: ” + value ); this.stack[ chúng tôi ] = value; } printElements(id) { let elements = “”; for(vari=0;i<=this.top;i++){ elements += this.stack[i] + ” “; } console.log( elements ); document.getElementById(id).innerHTML += elements; } isEmpty(){ return chúng tôi === -1; } size() { return chúng tôi + 1; } pop() { if(this.isEmpty()){ return “Stack is Empty”; } else { varval = this.stack[this.top]; this.top –; return val; } } peek() { if(this.isEmpty()){ return “Stack is Empty”; } else { varval = this.stack[this.top]; return val; } } } let myStack = new Stack(); myStack.push( 5 ); myStack.push( 10 ); myStack.push( 12); myStack.push( 20 ); myStack.push( 35 ); myStack.printElements(“result1”); document.getElementById(“result2”).innerHTML += myStack.peek(); myStack.printElements(“result3”);

Output:

6. clear

This method will clear all the elements in the stack. This method will reset the stack pointer i.e Top to -1 and all the elements from the stack will be cleared out. isEmpty() method should return true after this operation.

Code:

JavaScript Stack .body-data { border : #81D4FA 2px solid; background-color : #03a9f400; text-align : left; padding-left : 20px; padding-bottom: 20px; height : auto; width : auto; } .heading { font-weight: bold; border-bottom: 2px solid #ddd; font-size: 15px; width: 98%; } class Stack { constructor () { this.stack = []; this.top = -1; } push (value) { this.top++; console.log( “Inserting Element: ” + value ); this.stack[ chúng tôi ] = value; } printElements(id) { let elements = “”; for(vari=0;i<=this.top;i++){ elements += this.stack[i] + ” “; } console.log( elements ); document.getElementById(id).innerHTML += elements; } clear() { this.top=-1; return “Stack Cleared”; } } let myStack = new Stack(); myStack.push( 5 ); myStack.push( 10 ); myStack.push( 12); myStack.push( 20 ); myStack.push( 35 ); myStack.printElements(“result1”); document.getElementById(“result2”).innerHTML += myStack.clear(); myStack.printElements(“result3”);

Output:

Recommended Articles

This is a guide to JavaScript Stack. Here we also discuss the definition and Javascript stack methods along with different examples and their code implementation. You may also have a look at the following articles to learn more –

How To Create Matlab Object? (Examples)

Introduction to Matlab Object

The MATLAB language uses many specialized objects. For example, Exception objects, timer objects, the serial object, and so on. MATLAB toolboxes are used to define objects to manage data and analyses performed by the toolbox. Objects provide specific functionality that is not easily available from general-purpose language components. Objects are used to inform when errors occur, to execute code at a certain time interval, to enables you to communicate with devices connected to your computer’s serial port, etc.

Syntax:

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Object_name = class_name;

How to Create Matlab Object?

To create an object, first, we need to create a class, using ‘ classdef ’ we create a class, in class we take some properties and end the class and then we take methods some methods using function statements after all these lastly we end the class with an end statement. First, we save the class using the .m extension.

Now, take a new Matlab script and create an object using the same class name which we used to create a class. For creating the object we write syntax like:

Object_name = class_name;

Let’s consider a1 is an object name and BasicClass1 is a class name. In class, we create 1 property and 3 methods. After creating an object of class we can perform the several operations on a class by using that class object:-

For accessing the properties to assign the data.

To perform operations on data calling of the method.

We saw all the properties and their current values available in the class.

Examples to Implement Matlab Object

Let see the first example, in this example first, we create one class, that class name is ‘BasicClass1 ’. In this class we take a property like value, the must be only the numbers. Then we take a method, basically, methods are nothing but operations that defined by the class. We create some operations and then we end the method also with an end statement. And then finally we end the BasicClass1 class with an end statement. In methods for operations, we use some functions. This code saves using the .m extension.

Code:

end

Example #1

Let us see to create an object and how it’s used. In this example we can create an object with the respected class name in our example it’s ‘ BasicClass1 ’, we create objects namely ‘a1’. Initially the value of the property it’s empty. Then using objects we can access the properties of the class that’s nothing but the property is value. So we assign some number to the value property using a class object, and simply it can display it.

Code:

Output: 

 As we have seen in the command window the output was value = [ ] empty. Because the initial value of property is empty. Then we assign the number to property value and the number is pi (3.142) / 3 and displays it using the class object.

Example #2

Let us see an example, for this example also we use the same class that’s ‘BasicClass1’. First, we simply create an object for the same class name that’s BasicClass1. Then we can assign the number to property value and display it. Then after we call the methods of that class by using the help of class object ‘a1’. We called the method name, the method name is ‘multiplyBy (obj1 , n1)’ multiplying operation by the given number in parenthesis we simply pass the argument and then display the result.

Code:

multiplyBy(a1,3)

Example #3

Let us see an example, for this example also we use the same class that’s ‘BasicClass1’. First, we simply create an object for the same class name that’s BasicClass1. Then we can assign the number to property value and display it. Then after we call the methods of that class by using the help of class object ‘a1’. We called the method name, the method is ‘divideBy (obj1 , n1)’ divide operation by the given number in parenthesis we simply pass the argument and then display the result.

Code:

a1.divideBy( 2 )

Output: 

Conclusion

In this article, we saw the concept of Matlab object. We understood the basic concept and different ways to use Matlab objects and what exactly is a Matlab object.  And also we saw the syntax. Also first we saw how to declare or create a class on Matlab and then how to create a class object. And what operations we perform using that class object.

Recommended Articles

This is a guide to Matlab Object. Here we discuss the Introduction of Matlab Object and how to Create along with different Examples as well as its Code Implementation. You can also go through our suggested articles to learn more –

How To Print On An Envelope In Microsoft Excel

Microsoft Office lets you print envelopes individually or as a mass mail merge. This is incredibly valuable for businesses that need to add branding and other custom elements to an extensive mailing list.

Here’s how you can print on an envelope in Microsoft Excel. Remember that you need both Microsoft Word and Excel to make this work. This method should work regardless of whether you’re using the Microsoft suite on a Windows PC or a Mac.

Table of Contents

Step 1: Create Your Mailing List

The first step is to create the list of recipients to whom you will send mail. You can skip this step if you only need to print one or two envelopes. However, this step is essential for those working with large mailing lists.

To create your mailing list:

Open

Microsoft Excel

.

Verifying your addresses at this step is important to avoid wasting time and money printing old or incorrect data.

Step 2: Design Your Envelope

Next, you need to prepare your envelope template in Microsoft Word. This is the document you will set up to populate with your recipient’s addresses when printing automatically.

To do so:

Open a blank document in Microsoft Word.

Select the

Mailings

tab.

Now specify what paper size your envelopes are to be. To do so, select the

Preview icon

.

In the

Envelope Options

tab, select the drop-down menu under

Envelope size

.

Next, select

Font…

next to the

Delivery address

box or

Return address

to set the font you want for both options.

Select

OK

.

Step 3: Set the Printer Feed

The next step is to tell Microsoft Word how your printer feed works. This ensures that your envelopes will be printed correctly, with all elements in the proper organization.

To set the printer feed:

Select

Options

.

In the

Feed method

window, select the orientation for how your envelope will feed into the printer. We recommend selecting a method where the envelope borders the edge of the feed tray, as it will make it easier to place the envelope in your printer. Note that the delivery and return addresses will be misaligned if your envelope isn’t correctly positioned.

Select

Face up

or

Face down

to define which way up you will load the envelope.

Step 4: Start the Mail Merge and Link Your Mailing List

It’s time to begin the mail merge. This will allow Microsoft Word to automatically add the names and addresses from your address list data source.

To do so:

If any addresses need to be edited, you can select

Edit Recipient List

to change them.

Choose an option, then select

OK

.

Step 5: Print the Envelopes

If everything looks correct, it’s time to complete the mail merge and print addresses onto your envelopes. To do so:

Select

Finish & Merge,

then

Print Documents…

Finally, make sure “All” is checked and select

OK

.

Make sure the printer settings are correct, and your envelopes are correctly aligned then select

OK

again. Your printer should now begin printing your envelopes.

Don’t Forget Stamps

Unfortunately, you can’t print envelopes using Excel alone. However, with the combination of MS Word and Excel, the envelope printing process is incredibly easy. With this tutorial, you should have your next batch of mail ready to go in no time. Don’t forget to pay for postage!

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