Transduce over any Iteratable Collection

Hi, Paul! The transduce function works perfectly with arrays but there are some issues with strings: http://take.ms/e7fve

I guess your imported functions from './utils' differ from functions in the previous video. My code is here https://stackblitz.com/edit/react-b77tn4

Hello Anton, your map and filter functions are missing the return statements. They should be like:

const map = (xf) => reducer => {
    return (acc, val) => {
      // for string concat, the original string is NOT modified,
      // unlike the push reducer which mutates the array
        return reducer(acc, xf(val)); 
    };
};

const filter = (predicate) => reducer => {
    return (acc, val) => {
        if (predicate(val)) return reducer(acc, val); // same reason here
        return acc;
    };
};

Bijoy, thanks a lot! Really helpful!

Glad it helped!

Thanks for responding Bijoy! Yep that's spot on, you should not be relying on the fact that the push reducer mutated the array. I never added the return statement into the map function in lesson 4, but it should be there (and is there in the version imported from utils.js). I thought I flagged this error here already but it must have been in a twitter response, so sorry for the confusion.

hi @paul, what editor/plugin do you use to see the answers to your functions using / *? * /

hi @paul, what editor/plugin do you use to see the answers to your functions using / *? * / hey @sebastian, it's called quokka.js