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Quiz Questions

Can you give an example of a curry function and why this syntax offers an advantage?

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Currying is a pattern where a function with more than one parameter is broken into multiple functions that, when called in series, will accumulate all of the required parameters one at a time. This technique can be useful for making code written in a functional style easier to read and compose. It's important to note that for a function to be curried, it needs to start out as one function, then broken out into a sequence of functions that each accepts one parameter.

function curry(fn) {
if (fn.length === 0) {
return fn;
function _curried(depth, args) {
return function (newArgument) {
if (depth - 1 === 0) {
return fn(...args, newArgument);
return _curried(depth - 1, [...args, newArgument]);
return _curried(fn.length, []);
function add(a, b) {
return a + b;
var curriedAdd = curry(add);
var addFive = curriedAdd(5);
var result = [0, 1, 2, 3, 4, 5].map(addFive); // [5, 6, 7, 8, 9, 10]
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