find_occurence_in_array.js

let story = "really very basically bla bla ba afara este frig. Ana are mere. Javascript drives me very mad. But basically it is used everywhere. Very Ana Ana Ana really";

let overUsedWords = ["really", "very", "basically", "Ana"];
let storyWords = story.split(" ");

let freq = {}
for (storyWord of storyWords)
{
       for(overUsedWord of overUsedWords)
       {
            if(storyWord.toLowerCase() === overUsedWord.toLowerCase())
            {
                if(freq[overUsedWord])
                {
                    freq[overUsedWord]++;
                }
                else
                {
                    freq[overUsedWord] = 1;
                }
            }            
       }        
    
}

console.log(freq)