Implement a custom currying function.

Q: Implement a custom currying function.

// advanced currying const curry = (fn) => { return (curried = (...args) => { if (fn.length !== args.length) { //recursively return a function bound with previous sent argument //with null you're essentially decoupling the function from any specific object context. return curried.bind(null, ...args); } // returned when curried is bound with all three arguments return fn(...args); }); }; const totalNum = (x, y, z) => { return x + y + z; }; const curriedTotal = curry(totalNum); console.log(curriedTotal(10)(20)(30)); //modern currying const sendRequest = (greet) => (name) => (message)=> console.log(`${greet} ${name}, ${message}`);

Difficulty: 5/10

higher-order functions, partial application, function composition

javascript

Scenario Questions

0-2 years experience

1We have a simple function add(a, b) that returns a + b. How would you write a curried version so that add(2)(3) works?
2If you call your curried function with only the first argument and then later with the second, what does it return? Walk me through the steps.
3What happens if you pass three arguments to a curried version of a two‑parameter function?

Follow-up Questions

Can you show a quick example of using your curry with a two‑argument function?
What edge cases would you test for this implementation?
How would you modify it to preserve the original function's this binding?