All 10 Functional Programming questions
More in Functional Programming
What is a pure function? What does 'immutability' mean and why does functional code favor it? What is a higher-order function? What is function composition and how do you implement it? Why are recursion and immutable data often used together in functional style, instead of loops with mutable counters? What does 'referential transparency' mean, and how does it enable optimizations like memoization? How do you implement a debounce function using closures, and how is it a functional programming technique? What are functors and monads, at a practical level, and does JavaScript have native support for them? How do you avoid deeply nested, mutation-heavy code when updating nested state immutably?
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JavaScript › Functional Programming

What is currying and what problem does it solve?

Intermediate

Answer

Currying transforms a function taking multiple arguments into a sequence of functions each taking a single argument, allowing you to partially apply some arguments early and reuse the resulting specialized function later.
const curriedAdd = (a) => (b) => (c) => a + b + c;
const addFive = curriedAdd(5);
addFive(2)(3); // 10
Real-world example Creating a reusable, pre-configured validator like isLongerThan(8) from a generic two-argument comparison function.

Common follow-ups: How does currying relate to partial application, and are they the same thing?

Closures
All 10 Functional Programming questions