Use Arrow functions for event callbacks instead of binded functions

arrow_function_vs_bind.js

/* preferred way */
handleClick={() => self.handleClick(index)}
//(or)
handleClick={e => self.handleClick(e, index)}
​
/* current way */
handleClick={this.handleClick.bind(this, index)}
//(or)
handleClick={this.handleClick.bind(null, index)}