Adding items to state.

AppJsUpgrade1.js

import React from 'react';

class App extends React.Component {

  constructor() {
    super();
    this.state = {
      id: null,
      userId: 1,
      food: '',
      cost: '',
      status: false,
      foodItem: {},
      foodItems: [],
      editing: false
    };
    
    this.handleInputChange = this.handleInputChange.bind(this);
    this.addFoodItem = this.addFoodItem.bind(this);
  }

  handleInputChange(event) {
    event.preventDefault();
    const target = event.target;
    const value = target.value;
    const name = target.name;
 
    this.setState({
      [name]:value
    })
  }

  addFoodItem(event){
    event.preventDefault()
    if (!this.state.food) return;
    const foodItem = {
      id: this.state.foodItems.length + 1,
      food: this.state.food,
      cost: this.state.cost,
      userId: this.state.userId,
      statu: this.state.status
    };

    this.setState({
      food: '',
      cost: '',
      foodItem: foodItem,
      foodItems: [...this.state.foodItems, foodItem]
    })
  }
}

export default App;