similarity.js

/* WhatsAsena Duplicated - Artificial Intelligence Similarity
Codded by lyfee

function similarity(first, second) {
	first = first.replace(/\s+/g, '')
	second = second.replace(/\s+/g, '')

	if (first === second) return 1; // identical or empty
	if (first.length < 2 || second.length < 2) return 0; // if either is a 0-letter or 1-letter string

	let firstBigrams = new Map();
	for (let i = 0; i < first.length - 1; i++) {
		const bigram = first.substring(i, i + 1);
		const count = firstBigrams.has(bigram)
			? firstBigrams.get(bigram) + 1
			: 1;

		firstBigrams.set(bigram, count);
	}

	let intersectionSize = 0;
	for (let i = 0; i < second.length - 1; i++) {
		const bigram = second.substring(i, i + 1);
		const count = firstBigrams.has(bigram)
			? firstBigrams.get(bigram)
			: 0;

		if (count > 0) {
			firstBigrams.set(bigram, count - 1);
			intersectionSize++;
		}
	}

	return (2.0 * intersectionSize) / (first.length + second.length - 2);
}
module.exports = {similarity:similarity}
*/