var arr = [
  {name: "Вася", age: 25},
  {name: "Петя", age: 22},
  {name: "Маша", age: 19},
];

arr[arr.length] = {name: "Катя", age: 18};

module: {
        loaders: [
        {
            test: /\.jsx?$/,
            exclude: /node_modules/,
            loaders: ['react-hot', 'babel?presets[]=react,presets[]=es2015']
        },
        {
            test: /\.scss$/,
            loaders: ["style", "css", "sass"]
        }
        ]
    }

switch (process.env.NODE_ENV) {
  case 'prod':
  case 'production':
    module.exports = require('./config/webpack.prod');
    break;
  case 'test':
  case 'testing':
    module.exports = require('./config/webpack.test');
    break;
  case 'dev':
  case 'development':
  default:
    module.exports = require('./config/webpack.dev');
}