Answer 1

const str114 = 'abcaakjbb';
	let r = str114.substr(1)
	const obj114 = str114.split('').reduce((pre, current) => {
		if (r === current) {
			pre[current] += 1
		} else {
			pre[current] = 1
		}
		r = current
		return pre; 
	}, {});
	const max114 = Math.max(...Object.values(obj114));
	for (const i in obj114) {
	  if (obj114[i] !== max114) delete obj114[i]
	}
	console.log(obj114);