JS map return object

Question

I got this array,

var rockets = [     { country:'Russia', launches:32 },     { country:'US', launches:23 },     { country:'China', launches:16 },     { country:'Europe(ESA)', launches:7 },     { country:'India', launches:4 },     { country:'Japan', launches:3 } ]; 

What do I need to do to return an array mapped, that adds 10 to each

launches

value, here my first approach,

var launchOptimistic = rockets.map(function(elem){   // return  elem.launches+10;      return (elem.country, elem.launches+10);   }); console.log(launchOptimistic); 

Answer 1

Use .map without return in simple way. Also start using let and const instead of var because let and const is more recommended

const rockets = [      { country:'Russia', launches:32 },      { country:'US', launches:23 },      { country:'China', launches:16 },      { country:'Europe(ESA)', launches:7 },      { country:'India', launches:4 },      { country:'Japan', launches:3 }  ];    const launchOptimistic = rockets.map(elem => (    {      country: elem.country,      launches: elem.launches+10    }   ));    console.log(launchOptimistic);