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what does it mean to implement a function

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reduce() Function JavaScript

Introduction to reduce() Function JavaScript

The reduce() function reduces the array values into a unmarried value. The reduce() function never modified the original array. The reduce() function operates the array values from left to right. The resultant of reduce() part will be stored in a variable called the accumulator. If suppose array can not contain any values then reduce() function will not be executed.

Real-Time Application: When we need to perform the abiding operation on array values sequentially like add-on, subtraction, multiplication, etc. and so reduce() function used.

How does reduce() Office work in JavaScript?

reduce() function takes array values as an statement and performs the reduction action past accessing array elements sequentially. Observe below syntax carefully

Syntax:

var arrayElements=[];
arrayElements.reduce( functionName(full, presentValue, presentIndex, actualArray), intialArrayValue);

Explanation:functionName(total, presentValue, presentIndex, actualArrayObject)

This function contains 4 arguments, they are explained below

  • total: It is used for initializing the value or used to specify the function previous return value.
  • presentValue: It is used for specifying the present value of the assortment.
  • presentIndex: It is used for specifying the nowadays index of the array.
  • actualArrayObject: It is used for passing the array objects. It is an optional parameter.
  • initialArrayValue: It is used for passing any user-defined initial value to the function. It is an optional parameter.

JavaScript Logic

JavaScript logic tin be written in a split file and we can include it in an HTML folio or we can direct write inside the HTML page.

reduce() function working principle:
var assortment=[one,2,3,4];
arrayElements.reduce(getSum(total,assortment)
{
return total+array;
});

Equally nosotros discussed reduce function performs operation from left to right side:

1. Initially total=0

  • array=1 from assortment elements
  • 0+1=1;

2. At present full=1

  • Array side by side element array=2
  • i+two=3;

3. Now full=3

  • Assortment next element array=3
  • 3+3=6;

4. Now at concluding full=vi

  • Array next chemical element assortment=4
  • 6+4=10;

Same as above it performs as per the logic defined with reduce function.

How to Include External JavaScript (.js) file within HTML page?

We tin can include external .js file within <head></caput> tag by using below syntax.

Syntax:

<caput>
<script blazon="text/javascript" src="path to javascript-file.js"></script>
</head>

How to Include or write JavaScript (.js) logic  inside the HTML page?

We can write inside <head></head> tag or inside <body></body> by using below syntax.

Syntax:

<head>
<script type="text/javascript">
//JavaScript Code
</script>
</head>

OR

<body>
<script type="text/javascript">
//JavaScript Code
</script>
</trunk>

Examples to Implement reduce() Office JavaScript

Below are examples to implement:

Case #ane

reduce() part with add-on.

Code:

<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-ane">
<title>Reduce function</championship>
<!-- JavaScript Logic inside the HTML head tag -->
<script>
/* defining array elements */
var arrayElements = [ five, 10, 15, 20, 25, 30 ];
//logic for addition of all numbers
function getAddition(full, number) {
render full + number;
}
</script>
<!-- CSS styles -->
<style type="text/css">
.addClass {
groundwork: dark-brown;
font-size: 20px;
border: 2px solid green;
text-align: justify;
}
h1 {
color: orange;
marshal-content: center;
}
trunk {
background: orange;
}
.sum {
background: green;
font-size: 20px;
border: 2px solid blue;
text-align: justify;
}
</fashion>
</caput>
<torso>
<div class="addClass">
<h1 class="h1">Addition with reduce() function</h1>
<p>In this example nosotros covered the improver of all array elements
by using reduction office. It but adds each element with
previous sum of elements</p>
</div>
<div class="sum">
<script>
/* calling getAddition function from reduce function and displaying sum*/
certificate.write("Addition of array elements are=>"
+ arrayElements.reduce(getAddition));
</script>
</div>
</body>
</html>

Output:

reduce() Function JavaScript - 1

Case #2

reduce() role with Multiplication

Code:

<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<championship>Reduce function</championship>
<!-- CSS styles -->
<style type="text/css">
.content {
background: aqua;
font-size: 20px;
border: 2px solid carmine;
text-marshal: justify;
}
h1 {
colour: greenish;
marshal-content: center;
}
.main {
background: lime;
font-size: 20px;
edge: 2px solid reddish;
text-marshal: justify;
}
</manner>
</head>
<torso>
<div course="content">
<h1 class="h1">Multiplication with reduce() part</h1>
<p>In this example we covered the multiplication of all assortment
elements by using reduction role. It merely multiplies each
chemical element with previous sum multiples of elements</p>
</div>
<div class="chief">
<!-- including JavaScript file inside body tag -->
<script blazon="text/javascript">
//JavaScript Logic
/* defining array elements */
var arrayElements = [ five, 10, 15, 20, 25, 30 ];
// logic for multiplication of all numbers
part getMuliplication(total, number) {
return total*number;
}
/* calling getMltiplication function from reduce function and displaying sum */
document.write("Muliplication of array elements are=>"
+ arrayElements.reduce(getMuliplication));
</script>
</div>
</body>
</html>

Output:

reduce() Function JavaScript - 2

Example #3

reduce() function with division of elements

Code:

<!DOCTYPE html>
<html>
<caput>
<meta charset="ISO-8859-i">
<title>Reduce function</title>
<!-- CSS styles -->
<manner type="text/css">
.content {
background: lime;
font-size: 20px;
border: 2px solid blue;
text-marshal: justify;
}
h1 {
colour: black;
align-content: center;
}
.main {
background: red;
font-size: 20px;
border: 2px solid blue;
text-align: justify;
}
</style>
</head>
<body>
<div class="content">
<h1 course="h1">Division with reduce() function</h1>
<p>In this instance we covered the division of all assortment elements
by using reduction function. Information technology simply divides each element with
previous division of elements</p>
</div>
<div class="main">
<!-- including JavaScript file within trunk tag -->
<script type="text/javascript">
//JavaScript Logic
/* defining array elements */
var arrayElements = [ 5000000000, 100000, 10000, 100, 10, five ];
// logic for sectionalisation of all numbers
function getDivision(full, number) {
return full / number;
}
/* calling getDivision function from reduce office and displaying sum */
document.write("Partition of array elements are=>"
+ arrayElements.reduce(getDivision));
</script>
</div>
</body>
</html>

Output:

division of elements

Instance #iv

reduce() function with subtraction of elements.

Code:

<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-ane">
<title>Reduce function</title>
<!-- including JavaScript file inside body tag -->
<script type="text/javascript">
//JavaScript Logic
/* defining assortment elements */
var arrayElements = [ 105, xx, 10, 4, three, 2 ];
// logic for subtraction of all numbers
office getSubtraction(total, number) {
return total - number;
}
</script>
<!-- CSS styles -->
<mode blazon="text/css">
.content {
background: lightblue;
font-size: 20px;
edge: 2px solid red;
text-align: justify;
}
h1 {
color: blackness;
align-content: center;
}
.main {
background: lime;
font-size: 20px;
edge: 2px solid red;
text-align: justify;
}
.orginal {
background: olive;
font-size: 20px;
edge: 2px solid reddish;
text-align: justify;
}
</style>
</caput>
<body>
<div class="content">
<h1 grade="h1">Subtraction with reduce() part</h1>
<p>In this instance we covered the Subtraction of all assortment
elements by using reduction role. It simply subtract each element
with previous subtraction of elements</p>
</div>
<div class="main">
<script>
/* calling getSubtraction part from reduce function and displaying sum */
certificate.write("Subtraction of array elements are=>"
+ arrayElements.reduce(getSubtraction));
</script>
</div>
<div course="orginal">
<script>
document.write("Original array=>"+arrayElements);
</script>
</div>
</body>
</html>

Output:

subtraction of elements

Caption:Every bit you can observe from the output reduce() function cannot modify the actual assortment. We can run across it in the above output.

Decision

reduce() function used for reducing the assortment into a single value by performing any operation on to it. Reduce function cannot modify the original array elements.

Recommended Articles

This is a guide to reduce() Office JavaScript. Here we talk over Syntax JavaScript logic, include, exclude with examples to implement with proper codes and examples. You tin also go through our other related articles to learn more –

  1. pop() in JavaScript
  2. JavaScript indexOf()
  3. isNaN() JavaScript
  4. Javascript Prototype

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Source: https://www.educba.com/reduce-function-javascript/

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