Below is the function that I am trying to create:

/**
 * @param {(sentence: string) => boolean} criterion - a function that
 *  takes a sentence and returns a boolean
 * @param {string[]} sentences - an array of space-separated strings of words
 * @returns {string[]} the subset of `sentences` for which `criterion` returns true
 */
const getRelevantSentences = (about, sentences) => {
      if(about(sentences)){
        return [sentences];
      }
      else {
        return [];
      }
}

Where about() is derived from the following code:

/**
 * @param {string[]} topics - an array of topic words
 * @param {string} sentence - a space-separated string of words
 * @returns {boolean} whether `sentence` contains any of the words in `topics`
 */
const isRelevant = (topics, sentence) => {
  for(i=0; i<topics.length;i++){
    if (sentence.includes(topics[i])) {
      return true;
    }
  }
  return false;
};

/**
 * @param {string[]} topics - an array of topic words
 * @returns {(sentence: string) => boolean} a function that takes a sentence
 *  and returns whether it is relevant to `topics`
 */
const about = (topics) => {
    return function(sentence) {
      return isRelevant(topics,sentence);
    }
};

And any data needed is:

const sentence = "the quick brown fox jumps over the lazy dog";

const sentences = ["I have a pet dog","I have a pet cat","I don't have any pets"];

The desired effect for getRelevantSentences() is that it takes in a function and an array, and returns an array that makes the function that was passed in true. In other words, I am trying to return a subset of sentences that make the boolean (the about() function) true.

I know the answer is something simple. I feel like I should not be using the about() function and instead should be using the function within it, but I don’t know how I would call that.

Any help is greatly appreciated. I apologize if I overcomplicated anything.