ReactJS

What is a higher-order function in JavaScript?

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Introduction

In JavaScript, Higher-order function(HOF) is a function that accepts functions as parameters and/or returns a function

HOFs are a fundamental concept in JavaScript and functional programming. They can help developers write clean, reusable, and expressive code. Some benefits of using HOFs include:

Reusability :-

HOFs allow developers to create reusable functions to solve problems without rewriting the same code multiple times.

Separation of data and logic:-

HOFs allow developers to separate data and logic, making the code more readable and maintainable.

Example :

.reduce() Method: Iterates through an array and returns a single value
.forEach() Method: Executes a callback function on each of the elements in an array in order
.map() Method: Returns a new array made up of the return values from the callback function

const numbers = [1, 2, 3, 4, 5];

// HOF: Using map to double each number

const doubled = numbers.map(num => num * 2);console.log(doubled); // [2, 4, 6, 8, 10]

Conclusion

Higher-order functions allow us to abstract over actions, not just values. They come in several forms. For example, we can have functions that create new functions. We can also have functions that change other functions.

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