1007. Minimum Domino Rotations For Equal Row

/**
 * @param {number[]} A
 * @param {number[]} B
 * @return {number}
 */
var minDominoRotations = function (A, B) {
	const len = A.length,
		check = (val, A, B) => {
			let rotationsA = 0,
				rotationsB = 0

			for (let i = 0; i < len; i++) {
				const a = A[i],
					b = B[i]
				if (a !== val && b !== val) return -1
				if (a !== val) rotationsA++
				else if (b !== val) rotationsB++
			}
			return Math.min(rotationsA, rotationsB)
		}

	const rotations1 = check(A[0], B, A)
	if (rotations1 !== -1 || A[0] === B[0]) return rotations1
	const rotations2 = check(B[0], A, B)
	return rotations2
}

const A = [2, 1, 2, 4, 2, 2],
	B = [5, 2, 6, 2, 3, 2]

const A1 = [3, 5, 1, 2, 3],
	B1 = [3, 6, 3, 3, 4]
//Test cases
console.log(minDominoRotations(A, B))
console.log(minDominoRotations(A1, B1))