Getting key prop warning in React, even though key is set

Question

Problem

I\'m getting this warning:

Warning: Each child in an array or iterator should have a unique \"key\" prop. Check the render method of

Answer 1

I had the problems too, and fixed it after follwing link.

like:

{_data.map(function(object, i){
     return 
 
           {[ object.name ,
       {object.city}  , // remove the key
          object.age
      ]}
; 
})}