propsInInitialStateImproved.js

import React, { Component } from 'react'

class MyComponent extends Component {
  constructor(props){
    super(props);
    this.state = {
      someValue: props.someValue,
    };
  }
  
  componentWillReceiveProps(nextProps){
    if (nextProps.inputValue !== this.props.inputValue) {
      this.setState({ inputVal: nextProps.inputValue })
    }
  } 
}