transducer-data-processing.js

(function() {
    console.log('Hello from the snippet');

    const user = {
        name: 'Cassie Cage'
    };
    const exampleTarget = {
        firstname: 'Cassie',
        surname: 'Cage',
    };
    const mapping = f => reducing => (result, input) =>
      reducing(result, f(input));

    const filtering = predicate => reducing => (result, input) =>
      predicate(input) ? reducing(result, input) : result;

    const chain = (xs, x) => xs.concat(x);
    const result = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
      .reduce(mapping(x => x + 1)(chain), [])
      .reduce(filtering(x => x % 2 === 0)(chain), []);
      // [2, 4, 6, 8, 10]

    console.log(result);

    const inspect = x => {
        console.log(x);
        return x;
    }
    const doNothing = x => x;
    const parseName = x => {
        const { name } = x;
        const [firstname, surname] = name.split(' ');
        const result = { firstname, surname };

        return result;
    };

    [user]
        .reduce(mapping(inspect)(chain), [])
        .reduce(mapping(parseName)(chain), [])
        .reduce(mapping(doNothing)(chain), [])

})();