JavaScript - Currying & Higher-Order Functions

Overview

Estimated time: 10–15 minutes

Currying and higher-order functions are powerful techniques for functional programming in JavaScript.

Learning Objectives

• Understand currying and its benefits.
• Write and use higher-order functions.

Prerequisites

• JavaScript - Copying (Shallow vs Deep)

Currying Example

function multiply(a) {
  return function(b) {
    return a * b;
  };
}
const double = multiply(2);
console.log(double(5)); // 10

Higher-Order Function Example

function withLogging(fn) {
  return function(...args) {
    console.log('Calling', fn.name);
    return fn(...args);
  };
}

Common Pitfalls

• Overusing currying can make code harder to read for beginners.

Summary

Currying and higher-order functions enable flexible, reusable code patterns.