transducer vs map

gistfile1.txt

const Rx = require('../../');
const fs = require('fs');
const t = require('transducers-js');
const R = require('ramda');
const _ = require('lodash');

const mappingReducer = f => reducer => (result, input) => {
  //console.log('enter mappingReducer', result, input);
  return reducer(result, f(input));
};

const filterReducer = p => reducer => (result, input) => {
  //console.log('enter filterReducer', result, input);
  return p(input) ? reducer(result, input) : result;
};

const transducer = R.compose(mappingReducer(x=>x+1), filterReducer(x=>x%2));
//const transducer = R.compose(filterReducer(x=>x%2), mappingReducer(x=>x+1));



const startTime1 = new Date();
const source = _.range(1, 10000000);
const result1 = source.reduce(transducer((result, input) => {result.push(input);return result;}), []);
//console.log(s);

//s.map(x => console.log(x));

const endTime1 = new Date();
console.log('time : ' + (endTime1 - startTime1));

const startTime2 = new Date();

const result2 = source.map(x=>x+1).filter(x=>x%2);

const endTime2 = new Date();
console.log('time : ' + (endTime2 - startTime2));