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What is functional programming in JavaScript?

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What is functional programming in JavaScript?

Asked on Jul 29, 2025

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Functional programming in JavaScript is a programming paradigm that treats computation as the evaluation of mathematical functions and avoids changing state or mutable data. It emphasizes the use of pure functions, immutability, and higher-order functions.

// Example of a pure function
        const add = (a, b) => a + b;

        // Higher-order function: takes a function as an argument
        const applyOperation = (operation, x, y) => operation(x, y);

        // Using the higher-order function
        const result = applyOperation(add, 5, 3);
        console.log(result); // Output: 8

Additional Comment:

A "pure function" is a function where the output value is determined only by its input values, without observable side effects.
"Higher-order functions" are functions that take other functions as arguments or return them as results.
Functional programming promotes "immutability", meaning data should not be changed after it is created.
This paradigm can lead to more predictable and easier-to-test code.

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What is functional programming in JavaScript?

Asked on Jul 29, 2025

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