Transducers difference?

transd.js

/* NINJA FP */

function mapping(transform) {
  return function (reduce) {
    return function (result, input) {
      return reduce(result, transform(input));
    };
  };
}

function filtering(predicate) {
  return function (reduce) {
    return function (result, input) {
      return (
        predicate(input) ?
          reduce(result, input) :
          result
      );
    };
  };
}

function compose(...reducers) {
  return (val) => {
    let result = val;

    reducers.reverse().forEach(r => {
      result = r(result);

      return result;
    });

    return result;
  };
}

const posts = [
  { author: 'Agatha',  text: 'just setting up my pstr' },
  { author: 'Bert',    text: 'Ed Balls' },
  { author: 'Agatha',  text: '@Bert fancy a thumb war?' },
  { author: 'Charles', text: '#subtweet' },
  { author: 'Bert',    text: 'Ed Balls' },
  { author: 'Agatha',  text: '@Bert m(' }
];

function graph(result, input) {
  result[input.from] = result[input.from] || [];
  result[input.from].push(input.to);
  return result;
}

const extractMentions = compose(
  // Find mentions
  filtering(function (post) {
    return post.text.match(/^@/);
  }),
  // Build object with {from, to} keys
  mapping(function (post) {
    return {
      from: post.author,
      to: post.text.split(' ').slice(0,1).join('').replace(/^@/, '')
    };
  })
);
const t = posts.reduce(extractMentions(graph), {});
console.log(t);

/* STRONG FP END */
///////////////

/* AMATEUR FP START */

function transduce(input, reducers) {
  return reducers.reduce(function (acc, reducer) {
    const args = reducer.args || [];

    return acc[reducer.type](reducer.value, ...args);
  }, input);
}

const extractMentions = function () {
  return [
    {
      type: 'filter',
      value: function (post) {
        return post.text.match(/^@/);
      }
    },

    {
      type: 'map',
      value: function (post) {
        return {
          from: post.author,
          to: post.text.split(' ').slice(0, 1).join('').replace(/^@/, '')
        };
      }
    },

    {
      type: 'reduce',
      value: function (result, post) {
        result[post.from] = result[post.from] || [];
        result[post.from].push(post.to);
        return result;
      },
      args: [{}]
    }
  ];
};

const posts = [
  { author: 'Agatha',  text: 'just setting up my pstr' },
  { author: 'Bert',    text: 'Ed Balls' },
  { author: 'Agatha',  text: '@Bert fancy a thumb war?' },
  { author: 'Charles', text: '#subtweet' },
  { author: 'Bert',    text: 'Ed Balls' },
  { author: 'Agatha',  text: '@Bert m(' }
];

const t = transduce(posts, extractMentions());
console.log(t);

/* AMATEUR FP END */