import React, { Component } from 'react';
    import { createValidation, success, failure } from 'validate';
    ...
    class TodoCreator extends Component {

        isEmpty = (n, input, msg) => {
            return n === '' ? failure([{ key: input, val: msg }]) : success();
        }

        handlerInput = ({ target }) => {
            const { name, value } = target;

            const errors = createValidation().ap(isEmpty('name1', name, 'is empty'))
                                                .ap(isEmpty('name2', name, 'is empty'))
                                                .orElse(new Map())
                                                .chain(e => e);

            this.setState({ [name]: value, errors: errors });
        }

        render() {
            return (
                <form>
                    <label>Name</label>
                    <input name="name" onChange={this.handlerInput} />
                </form>
            );
        }
    }
    ...