Search an array for matching attribute

for(var i = 0; i < restaurants.length; i++)
{
  if(restaurants[i].restaurant.food == 'chicken')
  {
    return restaurants[i].restaurant.name;
  }
}

you can also use the Array.find feature of es6. the doc is here

return restaurants.find(item => {
   return item.restaurant.food == 'chicken'
})