London 9 - turing - susan - JavaScript Core 1 - Week 3 - #161

Just want to share an interesting thing, you can actually use const in here!
Using const makes the variable cannot be reassigned, but doesn't mean it cannot be modified. (with arr.push() in this example)

You can learn more in this short video: https://www.youtube.com/watch?v=RE6qf3As-XU

Because the array and the object both are "By Reference", so they could be modified..

const arr = [1,2,3,4,5]
arr.push(2)
console.log(arr) //[ 1, 2, 3, 4, 5, 2 ]

const obj = {}
obj.text='hello'
console.log(obj) //{ text: 'hello' }

Your code works, but if you are adding 50 in the return value here anyway, do you really need the while loop?
Anyway, the question requires us to use while loop.

The problem is we could not control the random number must be greater than 50

Run a while loop, until n is greater than 50, do you think we can handle it?

It is do-while loop, not while loop. Do you have some tips?

Do you think we can acieve by putting return outside the do-while loop?

Now the 2nd version match your request?

These are example headlines which contain a number, should return by the function but failed

headlinesWithNumbers(["2", "2 words in here"])

What failed? Have you ran the npm run test?

Your code passed the test cases, but doesn't mean it is correct.
There are cases which contains number I think we should handle

allArticleTitles[i].search(regex) > 0->allArticleTitles[i].search(regex) >= 0

Have we considered genre?

The question states Each title in the resulting array should be the highest rated book in its genre.

For example, in the test case, "The Book Your Dog Wishes You Would Read" has the highest rating in the genre "non-fiction"

Do you think 3-2 2nd version could be simpler?

I would make use of the Map Object

function getHighestRatedInEachGenre(books) {
  const genreMap = new Map();
  for (let book of books) {
      const existingBook = genreMap.get(book.genre)
      if (existingBook == null || book.rating > existingBook.rating)
        genreMap.set(book.genre, book)
  }
  return Array.from(genreMap.values()).map(book => book.title)
}