Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Higher-Order Arrow Functions in JavaScript.
JavaScript treats functions as objects and allow us to pass functions as parameter to another function and even return functions from other functions. In JavaScript, the functions are first class functions i.e. we can store them in variable, objects and array. The higher order arrow functions can take function, return them or do both.
Following is the code for higher order arrow functions in JavaScript −
Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
body {
font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}
.result,
.sample {
font-size: 18px;
font-weight: 500;
color: rebeccapurple;
}
.result {
color: red;
}
</style>
</head>
<body>
<h1>Higher order arrow functions in JavaScript</h1>
<div class="sample">[22,33,44,55]</div>
<br />
<div class="result"></div>
<br />
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to double each element of the above array</h3>
<script>
let resEle = document.querySelector(".result");
let BtnEle = document.querySelector(".Btn");
let doubleNum = (ele) => {
return ele * 2;
};
let arr = [22, 33, 44, 55];
function doubleArray(arr, fn) {
let doubleArr = [];
arr.forEach((element) => {
doubleArr.push(doubleNum(element));
});
return doubleArr;
}
BtnEle.addEventListener("click", () => {
resEle.innerHTML = "New array = " + doubleArray(arr, doubleNum);
});
</script>
</body>
</html>Output
On clicking the ‘CLICK HERE’ button −
Updated on: 16-Jul-2020
265 Views
Advertisements