cannot read property of undefined state variables react code example

Example: Cannot read property 'setState' of undefined

//  way #1 - recommended
// puting .bind(this) after using the reference 

	<input onChange={this.onInputChange.bind(this)} placeholder="First Name" />
  
// way #2
// adding this line for each method you use
  
  constructor(){
	this.onInputChange = this.onInputChange.bind(this)
  }