Hackerrank stuff

repeated_strings.js

function repeatedString(s, n) {
	if (n < 1) return 0;
	let initialMatches = s.match(/a/gm);
    
	// Hackerrank is not down with nullish coalesce or even optional chaining AT ALL
	// Otherwise, you could simply say if (!initialMatches?.length)
	if (!initialMatches || !initialMatches.length) return 0;

	if (n < initialMatches.length) {
		return n;
	}
    
	let aCount = Math.floor(n / s.length) * initialMatches.length;
    
	let remainder = n % s.length;
	if (remainder) {
		// No optional chaining and definitely no nullish coalesce on Hackerrank
		// was throwing on a runtime error trying to read length of undefined. Stupid. Since "Test against custom input" does NOTHING, and we're not allowed to see input/output, just run it in the terminal against your own test cases.
		// aCount += s
// 			.slice(0, remainder)
// 			.match(/a/gm)?
// 			.length 
// 			?? 0;
		const remainingAs = s.slice(0, remainder).match(/a/gm) || [];
		const r = remainingAs.length;
		aCount += r;
	}
    
	return aCount;
}