I have the solution from looking at the hint but I don't know why my chosen code didn't work

Hi, so, the last part of my code below returned 188 when I tried to use it for trying to find the number of sentences in story. I looked at the hint and now I know what to do but I don’t understand why my option didn’t work.

let story = 'Last weekend, I took literally the most beautiful bike ride of my life. The route is called "The 9W to Nyack" and it actually stretches all the way from Riverside Park in Manhattan to South Nyack, New Jersey. It\'s really an adventure from beginning to end! It is a 48 mile loop and it basically took me an entire day. I stopped at Riverbank State Park to take some extremely artsy photos. It was a short stop, though, because I had a really long way left to go. After a quick photo op at the very popular Little Red Lighthouse, I began my trek across the George Washington Bridge into New Jersey.  The GW is actually very long - 4,760 feet! I was already very tired by the time I got to the other side.  An hour later, I reached Greenbrook Nature Sanctuary, an extremely beautiful park along the coast of the Hudson.  Something that was very surprising to me was that near the end of the route you actually cross back into New York! At this point, you are very close to the end.';

let overusedWords = ['really', 'very', 'basically'];

let unnecessaryWords = ['extremely', 'literally', 'actually' ];

let storyWords = story.split(' ');


let betterWords = storyWords.filter(better => {
  return better != unnecessaryWords;
});

let i = 0;
storyWords.forEach(word=> {
if (word === 'really'){
   i++;
} else if (word === 'very'){
   i++;
} else if (word === 'basically'){
   i++;
}});

let sentence = 0;
  storyWords.forEach(howMany=> {
    if (howMany.lastIndexOf === '.' || '!') {
      sentence++;
    }
  })
  console.log(sentence);

I then changed it to the following but it still didn’t work.

let sentence = 0;
  storyWords.forEach(howMany=> {
    if (howMany.lastIndexOf === '.' || howMany.lastIndexOf === '!') {
      sentence+=1;
    }
  })
  console.log(sentence);

Here’s the documentation for the lastIndexOf() method for strings: MDN - String lastIndexOf()

It’s a method that can be called to return an index number, but you’re using it like a value without calling it and comparing it to a string. There are some examples of that method being used on the page I linked.

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