React 0.13 class method undefined

Question

So i\'ve started with React and ES6 and got stuck with very basics. Really appreciate some help.

handleClick() throws an error:

Uncaught TypeError: C         


        

Answer 1

{menuItems.map(function(item) {
  return 
{item.text}
;
})}

Because your code is in strict mode (modules are always in strict mode), this is undefined inside the function you pass to .map.

You either have to explicitly set the context by passing a second argument to .map:

{menuItems.map(function(item) {
  // ...
}, this)}

Or use an arrow function:

{menuItems.map(
     item => 
{item.text}
)}