Match percentage

matchPercentage .js

const matchPercentage = (strA, strB) => {
	let result = 0;
	for (let i = strA.length; (i -= 1);) {
		if (typeof strB[i] == 'undefined' || strA[i] == strB[i]) {
			//
		} else if (strA[i].toLowerCase() == strB[i].toLowerCase()) {
			result += 1;
		} else {
			result += 4;
		}
	}
	return (
		100
		- ((result + 4 * Math.abs(strA.length - strB.length))
			/ (2 * (strA.length + strB.length)))
		* 100
	);
};

searchMovie(title.title ?? title.name, title.year)
    .then((movies) => {
      let show = movies[0];
      let match = 0;

      if (movies.length > 1) {
        for (const movie of movies) {
          if (matchPercentage(title.title ?? title.name, movie.title) > match) {
            match = matchPercentage(title.title ?? title.name, movie.title);
            show = movie;
          }
        }
      }
      return show;
    });

  matchPercentage('F9', 'F9') // 100
  matchPercentage('F9', 'F9: All In') //  -33.333333333333314
  matchPercentage('F9', '機動戦士ガンダムF91') // -53.84615384615387

// returns  F9: All In