reduce-intro-two.js

const vetApprovedDogs = [
  {name: 'Snookums', needsShots: false, breed: 'pug', age: 2},
  {name: 'Thor', needsShots: false, breed: 'hound', age: 1},
  {name: 'Wunderbar', needsShots: false, breed: 'pug', age: 9},
]

// The big report for the city, have to be sure we get this right!
const reportForCity = vetApprovedDogs.myReduce((report, dog) => {
  
  // Is this breed not in the report?
  if(!report[dog.breed]) {
    
    // Make a note that we have seen it once
    report[dog.breed] = 1
  }
  else {
    // We have already seen this breed, so just add one to the total
    report[dog.breed] ++
  }
  
  // Return the updated report to use again! 
  return report
  
  // Empty Object as second argument **and** the first iteration of 'report'
}, {})

console.log(reportForCity) // { pug: 2, hound: 1 }