Incrementing currentIndex

Slider.js

import React, { Component } from 'react'
import Slide from '../slide'
import LeftArrow from '../left-arrow'
import RightArrow from '../right-arrow'

export default class Slider extends Component {
  constructor(props) {
    super(props)

    this.state = {
      images: [
        "https://s3.us-east-2.amazonaws.com/dzuz14/thumbnails/aurora.jpg",
        "https://s3.us-east-2.amazonaws.com/dzuz14/thumbnails/canyon.jpg",
        "https://s3.us-east-2.amazonaws.com/dzuz14/thumbnails/city.jpg",
        "https://s3.us-east-2.amazonaws.com/dzuz14/thumbnails/desert.jpg",
        "https://s3.us-east-2.amazonaws.com/dzuz14/thumbnails/mountains.jpg",
        "https://s3.us-east-2.amazonaws.com/dzuz14/thumbnails/redsky.jpg",
        "https://s3.us-east-2.amazonaws.com/dzuz14/thumbnails/sandy-shores.jpg",
        "https://s3.us-east-2.amazonaws.com/dzuz14/thumbnails/tree-of-life.jpg"
      ],
      currentIndex: 0
    }
  }

  goToPrevSlide = () => {

  }

  goToNextSlide = () => {
    this.setState(prevState => ({
      currentIndex: prevState.currentIndex + 1
    }));
  }

  render() {
    return (
      <div className="slider">
        <Slide />

        <LeftArrow
         goToPrevSlide={this.goToPrevSlide}
        />

        <RightArrow
         goToNextSlide={this.goToNextSlide}
        />
      </div>
    );
  }
}