React form complication 6

wrap.js

componentWillMount() {
  let proxy = {}

  for (var i in this.state) {
    if (typeof this.state[i] === "function") {
      this.foos[i] = state[i].bind(null, proxy)
    } else {
      let key = i
      Object.defineProperty(proxy, key, {
        set: value => this.setState({ [key]: value }),
        get: () => this.state[key]
      })
    }
  }
}