FrontendHaltJavaScript·Advanced·Coding·1 min read
What is currying?
Short interview answer
Currying transforms a function of multiple arguments into a sequence of functions that each consume one argument, such as f(a, b) becoming f(a)(b). It differs from partial application, which fixes some arguments and may leave a function accepting several remaining arguments.
Example
const add = (a) => (b) => (c) => a + b + c;add(1)(2)(3); // 6
const add10 = add(10);add10(5)(1); // 16 — the first stage is reusedKey takeaway
Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.