React JS TypeError – this is not a function

<select value={this.state.selectedValue} onChange={this.handleChange} size={5}>
  <option value="grapefruit">Grapefruit</option>
  <option value="lime">Lime</option>
  <option value="coconut">Coconut</option>
  <option value="mango">Mango</option>
</select>

changecountry(value){
 //some code here
}
handlechange = (event) => {
  let value = event.target.value
 setTimeout(function (){
  this.changecountry(value)
}
}, 300);

I am trying to call changecountry inside setTimeout function.
getting this.changecountry is not a function error
what is wrong with this code?

>Solution :

Update your setTimeout to

setTimeout(() => this.changecountry(value) , 300);

this context will change inside function(){} in setTimeout. Arrow Function
is lexical scoped, will take reference from where it was created.