transducer-api-transducers.js

import { add, filterT, mapT, pipeT, transduce } from 'nanoutils';

const isEven = value => value % 2 === 0;

const transducers = array => {
  const transducer = pipeT(
    // transforms value to value + 1
    mapT(add(1)),
    // ignores odd values
    filterT(isEven),
  );
  
  // iterates over values + 1 which are not odd
  // applies add
  // starts from 0
  // gets values from array
  return transduce(transducer, add, 0, array);
}

const ages = [16, 23, 24]
transducers(ages)  // 24