React Cakes example component

Cakes.js

import React from 'react';
import { Link } from 'react-router-dom';

import api  from './Api';

class Cakes extends React.Component {

  constructor(props){
    super(props);
    this.state = {
      data: null,
      slug: props.match.params.slug
    };
  }
  
  componentWillMount(){
    api.loadCategories()
    .then((res) => {
      return res.data.filter((item) => item.slug === this.state.slug)
    }).then((data) => {
      this.setState({ data });
    });
  }
  
  render() {
    if (this.state.data === null) {
      return (
        <div>Carregando...</<div>
      );
    }

    return (
      <div>
        {this.state.data}
      </div>
    );
  }

}

export default Cakes;