squalvj

const path = require('path');

module.exports = {
   entry: './assets/js/dev/index.js',
   output: {
      filename: 'bundle.js',
      //  __dirname is a function that npm itself have in the library
      path: path.resolve(__dirname, './assets/js/dist')
   },
   module: {

squalvj

_onClickHandler: function _onClickHandler() {
   console.log('State before (_onClickHandler): ' + JSON.stringify(this.state));
   this.setState({
   dollars: this.state.dollars + 10
   }, () => {
   console.log('Here state will always be updated to latest version!');
   console.log('State after (_onClickHandler): ' + JSON.stringify(this.state));
   });
}

squalvj

import 'babel-polyfill'

//dont forget to import babel-polyfill for this Set

[... new Set(this.props.data.map(e => e.gender))]

squalvj

let data = [
  {
   id: 1,
   name: 'test',
   category: 'Kitchen'
  },
  {
   id: 2,
   name: 'Bacon',
   category: 'Fork'